Solutions and Colloids
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Questions and Answers

Which of the following statements accurately describes a solution?

  • A mixture where components are chemically bonded. (correct)
  • A heterogeneous mixture with visible particles that settle over time.
  • A substance that cannot dissolve another substance.
  • A homogeneous mixture of two or more substances in a single physical state.

In a saltwater solution, what is the solute?

  • The salt.
  • The mixture itself. (correct)
  • Neither, as both are solvents.
  • The water.

Which of the following is an example of a solution where gas is the solute?

  • Carbonated water. (correct)
  • Sugar dissolved in water.
  • Brass.
  • Saltwater.

Which of the following factors does NOT affect the rate at which a substance dissolves?

<p>Color of the solute. (B)</p> Signup and view all the answers

Which of the following best describes the term 'miscible'?

<p>Substances that do not mix in any proportion. (B)</p> Signup and view all the answers

If the temperature of a liquid solvent increases, what generally happens to the solubility of a solid solute?

<p>It increases. (C)</p> Signup and view all the answers

What is the effect of increasing pressure on the solubility of a gas in a liquid?

<p>Solubility decreases. (B)</p> Signup and view all the answers

Which of the following describes a 'concentrated' solution?

<p>A solution with a large amount of solute. (C)</p> Signup and view all the answers

What term describes a solution that contains more solute than it can theoretically hold at a given temperature?

<p>Saturated. (C)</p> Signup and view all the answers

What does 'weight percent' (wt%) express?

<p>The mass of the solute divided by the total mass of the solution, multiplied by 100%. (C)</p> Signup and view all the answers

What is the weight percent of a solution made by dissolving 5 grams of sugar in 95 grams of water?

<p>5% (A)</p> Signup and view all the answers

If you dissolve 20 grams of salt in enough water to make 200 mL of solution, what is the weight/volume percent (w/v%)?

<p>10% (B)</p> Signup and view all the answers

What is the total volume of a solution if a 10% (v/v) solution contains 25 mL of solute?

<p>250 mL (B)</p> Signup and view all the answers

What is the molarity of a solution containing 2 moles of solute in 4 liters of solution?

<p>0.5 M (A)</p> Signup and view all the answers

How many grams of NaCl (molar mass = 58.44 g/mol) are needed to prepare 500 mL of a 0.1 M NaCl solution?

<p>11.69 g (A)</p> Signup and view all the answers

7.45 g of potassium chloride (KCl) was dissolved in 100 g of water. Calculate the molality of the solution

<p>0.01 M (A)</p> Signup and view all the answers

What is the molality of a solution containing of 0.5 moles of solute dissolved in 250 g of solvent?

<p>$2 \text{ molal}$ (C)</p> Signup and view all the answers

If you dilute 50 mL of a 2.0 M solution to 200 mL, what is the new molarity?

<p>1.0 M (B)</p> Signup and view all the answers

Which process involves adding more solvent to decrease the concentration of a solution?

<p>Evaporation. (C)</p> Signup and view all the answers

In the dilution formula $M_1V_1 = M_2V_2$, what does the 'V' represent?

<p>The volume of the solution. (B)</p> Signup and view all the answers

How many milliliters of 5.0 M stock solution would you need to prepare 100 mL of 0.25 M solution?

<p>5 mL (B)</p> Signup and view all the answers

Which of the following is NOT a colligative Property?

<p>Surface Tension (D)</p> Signup and view all the answers

Which type of solution is brass, an alloy of copper and zinc?

<p>Gaseous solution. (C)</p> Signup and view all the answers

Which of the following is a characteristic of liquid solutions?

<p>The solute and solvent can only be separeated by evaporation. (C)</p> Signup and view all the answers

What is a key characteristic of gaseous solutions?

<p>They are always heterogeneous mixtures. (C)</p> Signup and view all the answers

Which of the following is an example of a solid dissolved in a liquid?

<p>Hydrogen in palladium (C)</p> Signup and view all the answers

Which of the following statements best describes a suspension?

<p>The particles are completely dissolved and invisible. (C)</p> Signup and view all the answers

What property distinguishes colloids from true solutions and suspensions?

<p>Colloids can be filtered easily. (C)</p> Signup and view all the answers

Which phenomenon explains why colloids appear cloudy or opaque?

<p>The Greenhouse effect. (B)</p> Signup and view all the answers

Which of the following is an example of a colloid?

<p>Milk. (D)</p> Signup and view all the answers

What is the primary difference between a solution and a suspension regarding particle size?

<p>Solutions have larger particles than suspensions. (B)</p> Signup and view all the answers

Which type of mixture can be separated by filtration?

<p>Suspensions (C)</p> Signup and view all the answers

Which of the following is the correct order of mixtures from smallest to largest particle size?

<p>Colloid &lt; Solution &lt; Suspension (B)</p> Signup and view all the answers

A scientist observes a mixture scattering a beam of light shone through it, but the mixture does not settle upon standing. Which type of mixture is the scientist most likely observing?

<p>A solution. (C)</p> Signup and view all the answers

Which of the following is true of an unsaturated solution?

<p>The rate of dissolving equals the rate of precipitation. (B)</p> Signup and view all the answers

What is the molarity of a solution prepared by dissolving 116.88 grams of NaCl into enough water to make 2.0 Liters of solution? (Molar mass of NaCl = 58.44 g/mol)

<p>1.0 M (B)</p> Signup and view all the answers

A solution of hydrochloric acid (HCl) is labeled as 36% by weight. The density of the solution is 1.18 g/mL. What is the molarity of the solution? (Molar mass of HCl = 36.5 g/mol)

<p>11.6 M (B)</p> Signup and view all the answers

Which of the following manipulations would likely decrease the solubility of $O_2$ gas in water?

<p>Adding more $O_2$ gas to the system (C)</p> Signup and view all the answers

Which of the following is a key characteristic of a true solution?

<p>It is a heterogeneous mixture. (C)</p> Signup and view all the answers

In saltwater, what role does the water play?

<p>It is the solvent. (B)</p> Signup and view all the answers

Which of the following solutions has a gas as the solute?

<p>Sugar water (B)</p> Signup and view all the answers

Which factor does NOT influence the rate at which a substance dissolves in a solvent?

<p>Temperature of the solvent (C)</p> Signup and view all the answers

What term describes two liquids that are able to mix in any proportion to form a homogenous solution?

<p>Polar (B)</p> Signup and view all the answers

How does increasing temperature typically affect the solubility of solid solutes in liquid solvents?

<p>It depends on the pressure. (B)</p> Signup and view all the answers

What characterizes a 'concentrated' solution?

<p>A solution that cannot dissolve any more solute. (B)</p> Signup and view all the answers

What does 'weight percent' (wt%) of a solution express?

<p>The volume of solute per 100 volumes of solution. (C)</p> Signup and view all the answers

If 5 g of sugar is dissolved in 95 g of water, what is the weight percent of the solution?

<p>10% (A)</p> Signup and view all the answers

What is the weight/volume percent (w/v%) if 20 g of salt is dissolved in enough water to make 200 mL of solution?

<p>20% (B)</p> Signup and view all the answers

If 7.45 g of potassium chloride (KCl) is dissolved in 100 g of water, what is the molality of the solution?

<p>1.0 m (C)</p> Signup and view all the answers

What is the molality of a solution if 0.5 moles of solute are dissolved in 250 g of solvent?

<p>0.125 m (B)</p> Signup and view all the answers

If 50 mL of a 2.0 M solution is diluted to 200 mL, what is the new molarity?

<p>1.0 M (B)</p> Signup and view all the answers

Which process describes adding more solvent to a solution?

<p>Saturation (C)</p> Signup and view all the answers

To prepare 100 mL of a 0.25 M solution, how many milliliters of a 5.0 M stock solution are required?

<p>5 mL (B)</p> Signup and view all the answers

What type of solution does brass exemplify, being an alloy of copper and zinc?

<p>Aqueous solution (C)</p> Signup and view all the answers

Which of the following is a typical characteristic of liquid solutions?

<p>The solute cannot be separated from the solvent by filtration. (D)</p> Signup and view all the answers

What is a defining trait of gaseous solutions?

<p>They always involve a liquid solvent. (C)</p> Signup and view all the answers

Which scenario exemplifies a solid dissolved in a liquid?

<p>Saltwater (salt in water) (B)</p> Signup and view all the answers

Which statement accurately describes a suspension?

<p>The mixture is clear and transparent. (B)</p> Signup and view all the answers

What characteristic distinguishes colloids from both true solutions and suspensions?

<p>Color (A)</p> Signup and view all the answers

Which phenomenon explains why colloids often appear cloudy or opaque?

<p>Brownian motion (B)</p> Signup and view all the answers

What is the primary difference between a solution and a suspension with regard to particle size?

<p>Suspensions have smaller particle sizes. (C)</p> Signup and view all the answers

Which kind of mixture can easily undergo separation via filtration?

<p>Colloid (C)</p> Signup and view all the answers

From smallest to largest particle size, what is the correct order of mixtures?

<p>Solution, Suspension, Colloid (C)</p> Signup and view all the answers

A scientist shines a beam of light through a mixture an observes the light being scattered. The mixture does not settle upon standing. What type of mixture is the scientist most likely observing?

<p>An emulsion (C)</p> Signup and view all the answers

Which statement is correct regarding an unsaturated solution?

<p>It contains the maximum amount of solute that can be dissolved. (C)</p> Signup and view all the answers

If 116.88 grams of NaCl is dissolved in enough water to make 2.0 L of solution, what is the molarity? (Molar mass of NaCl = 58.44 g/mol)

<p>1.0 M (B)</p> Signup and view all the answers

Hydrochloric acid (HCl) is 36% by weight and has a density of 1.18 g/mL. What is the molarity of the solution? (Molar mass of HCl = 36.5 g/mol)

<p>3.6 M (B)</p> Signup and view all the answers

Which of the following actions is likely to reduce the solubility of $O_2$ gas in water?

<p>Cooling the water. (D)</p> Signup and view all the answers

Identify the INCORRECT solute-solvent pairing.

<p>Brass: Zinc (solute), Copper (solvent) (D)</p> Signup and view all the answers

Assuming pressure remains constant, what typically happens to the solubility of a gas as temperature increases?

<p>Solubility decreases (B)</p> Signup and view all the answers

The solubility increased when substance X combined with water. What does this suggest about substance X?

<p>Radioactive properties (C)</p> Signup and view all the answers

What is the weight percentage of sodium chloride in a solution made by dissolving 2.25g of NaCl in 7.45g of $H_20$?

<p>10 percent (B)</p> Signup and view all the answers

If 10 grams of sugar are dissolved in 100 grams of water to yield a total mass of 110 grams, what is the weight percent?

<p>30.3 percent (D)</p> Signup and view all the answers

How much NaCl in grams is needed to make 500 grams of a 10% (wt%) solution?

<p>50g (A)</p> Signup and view all the answers

If 5 grams of solute are dissolved in 250 milliliters of solution, what is the w/v%?

<p>43% (A)</p> Signup and view all the answers

How many grams of salt are needed to prepare 250 milliliters of a 4% w/v solution?

<p>13g (A)</p> Signup and view all the answers

Find the total solution volume of a 5% solution of unknown solution that diluted a 10ml of solute

<p>400ml (B)</p> Signup and view all the answers

How many grams of NaBr (molar mass = 102.9 g/mol) would be needed to prepare 700 ml of 0.230 M NaBr solution?

<p>1.34g (B)</p> Signup and view all the answers

What is the molarity of a solution that was prepared by dissolving 14.2 g of $NaNO_3$ (molar mass = 85.0 g/mol) in enough water to make 350 mL of solution?

<p>0.74M (B)</p> Signup and view all the answers

What is volume of 6.0M NaOH needs to be diluted to prepare 5.00L if 0.10M NaOH

<p>0.83L (A)</p> Signup and view all the answers

If you dilute 175 mL of a 1.6 M solution of LiCl to 1.0 L, determine the new concentration of the solution.

<p>0.21M (B)</p> Signup and view all the answers

Which factor does NOT directly influence the solubility of a solute in a solvent?

<p>The chemical nature of the solute and solvent (D)</p> Signup and view all the answers

What is the primary reason alloys are often preferred over pure metals?

<p>Pure metals are always too soft for structural applications. (B)</p> Signup and view all the answers

Which characteristic is unique to liquid solutions compared to solid or gaseous solutions?

<p>They always consist of two or more gases. (C)</p> Signup and view all the answers

Which statement accurately describes the behavior of particles in a suspension?

<p>Particles are intermediate in size and scatter light, but do not settle. (D)</p> Signup and view all the answers

What is the phenomenon where light is scattered by particles in a colloid or suspension?

<p>The Greenhouse Effect (C)</p> Signup and view all the answers

What type of solution is formed when two or more gases are mixed together?

<p>A liquid solution (C)</p> Signup and view all the answers

In a solution of sugar dissolved in water, which component is the solute?

<p>The sugar (B)</p> Signup and view all the answers

Which of the following actions will likely increase the solubility of a solid solute in a liquid solvent?

<p>Adding more solute than the solvent can handle (C)</p> Signup and view all the answers

What term describes a solution that contains the maximum amount of solute that can be dissolved at a given temperature?

<p>Supersaturated (D)</p> Signup and view all the answers

To increase the rate at which a solute dissolves in a solvent, which method is generally NOT effective?

<p>Heating the solvent (C)</p> Signup and view all the answers

Which statement accurately describes 'miscible' substances?

<p>They can mix in any proportion to form a homogeneous solution. (C)</p> Signup and view all the answers

How does increasing the pressure affect the solubility of a gas in a liquid?

<p>It has no effect on the solubility. (C)</p> Signup and view all the answers

What is a defining characteristic of a 'dilute' solution?

<p>It contains a large amount of solute. (C)</p> Signup and view all the answers

What term describes a condition where a solution contains contains more solute than it can theoretically hold at a given temperature?

<p>Supersaturated (C)</p> Signup and view all the answers

If 15 grams of NaCl is dissolved in 135 grams of water, what is the weight percent (wt%) of NaCl in the solution?

<p>11.1% (C)</p> Signup and view all the answers

If 30 mL of ethanol is added to enough water to make 300 mL of solution, what is the volume/volume percent (v/v%)?

<p>20% (B)</p> Signup and view all the answers

You have a 20% (v/v) solution containing 40 mL of solute. What is the total volume of the solution?

<p>100 mL (C)</p> Signup and view all the answers

If 18 grams of glucose (molar mass = 180 g/mol) are dissolved in enough water to make 500 mL of solution, what is the molarity?

<p>0.3 M (B)</p> Signup and view all the answers

To prepare 250 mL of a 0.5 M solution of NaCl (molar mass = 58.44 g/mol), how many grams of NaCl are needed?

<p>3.65 g (B)</p> Signup and view all the answers

If 3.65 g of HCl (molar mass = 36.5 g/mol) are dissolved in 200 g of water, what is the molality of the solution?

<p>0.5 m (B)</p> Signup and view all the answers

To prepare a 0.5 m solution, 0.1 moles of solute are dissolved in how many kilograms of solvent?

<p>0.5 kg (B)</p> Signup and view all the answers

What is the process of reducing a solution's concentration by adding more solvent?

<p>Saturation (C)</p> Signup and view all the answers

In the dilution formula $M_1V_1 = M_2V_2$, what does the subscript '1' typically refer to?

<p>The amount of solvent added (B)</p> Signup and view all the answers

To prepare 250 mL of a 0.1 M solution from a 2.0 M stock solution, how many milliliters of the stock solution are needed?

<p>50 mL (B)</p> Signup and view all the answers

Which of the following is a property that depends on the concentration of solute particles, rather than the identity of the solute?

<p>Density (C)</p> Signup and view all the answers

What kind of solution is air, which consists primarily of nitrogen and oxygen gases?

<p>A liquid solution (C)</p> Signup and view all the answers

Which of the following is a common trait of all true solutions?

<p>They scatter light (C)</p> Signup and view all the answers

Which of the following is an example of a liquid dissolved in liquid solution?

<p>Humid air (C)</p> Signup and view all the answers

What is the key distinction between a colloid and a solution?

<p>Colloids are homogeneous, while solutions are heterogeneous. (B)</p> Signup and view all the answers

Which type of mixture is easily separated through filtration?

<p>All homogeneous mixtures (C)</p> Signup and view all the answers

From smallest to largest, how do particle sizes compare in solutions, colloids, and suspensions?

<p>Colloid &lt; Solution &lt; Suspension (A)</p> Signup and view all the answers

A mixture is observed to neither scatter light nor settle upon standing. How is it best classified?

<p>Solution (C)</p> Signup and view all the answers

What is a key characteristic of an unsaturated solution?

<p>It can dissolve additional solute. (C)</p> Signup and view all the answers

What is the molarity of a solution containing 10 grams of NaOH (molar mass = 40 g/mol) in 250 mL of solution?

<p>0.25 M (C)</p> Signup and view all the answers

A solution of sulfuric acid ($H_2SO_4$) is 49% by weight and has a density of 1.39 g/mL. What is the molarity of the solution? (Molar mass of $H_2SO_4$ = 98 g/mol)

<p>2.78 M (C)</p> Signup and view all the answers

Which action would most likely decrease the solubility of carbon dioxide ($CO_2$) gas in water?

<p>Cooling the water (C)</p> Signup and view all the answers

What factor primarily determines whether a solute will dissolve in a given solvent?

<p>The volume of the solvent. (C)</p> Signup and view all the answers

Which of the following operations will change the molality of a solution without changing the molarity?

<p>Adding more solvent, while keeping the solute constant (C)</p> Signup and view all the answers

What mass of potassium nitrate ($KNO_3$) is needed to prepare 250.0 mL of a 0.200 M solution using a volumetric flask? (Molar mass $KNO_3$ = 101.1 g/mol)

<p>2.53 g (B)</p> Signup and view all the answers

You have two solutions of copper sulfate ($CuSO_4$), Solution A is 0.5 M and Solution B is 2.0 M. Which solution is more concentrated, and by what factor?

<p>Solution B is more concentrated, by a factor of 2. (C)</p> Signup and view all the answers

Which of the following statements is always true for an ideal solution?

<p>The enthalpy of the solution is zero. (C)</p> Signup and view all the answers

Which of the following is the correct formula to calculate the number of moles of solute when molarity, M, and volume, V, are given?

<p>moles = M - V (D)</p> Signup and view all the answers

A chemist wants to create 450mL of 0.400M solution of $KMnO_4$ with a molar mass of 158.03 g/mol, how much grams should the chemist add?

<p>33.44 g (B)</p> Signup and view all the answers

Given a 12.0 M stock solution of HCl, a scientist needs to prepare 500 mL of a 0.500 M solution. How many mL of the stock solution are required?

<p>29.1 mL (A)</p> Signup and view all the answers

What is the process of slowly adding a solution of known concentration to another solution of unknown concentration to determine the concentration of the unknown solution?

<p>Dilution (B)</p> Signup and view all the answers

A mysterious compound is added to water and results in no change of the solution. When a beam of light is shone through it, the beam is visable. However, the particles do not settle. What can be deducted from this series of tests?

<p>It is a colloid (C)</p> Signup and view all the answers

An experiment calls for 35% $HNO_3$ ($MM=63.01 g/mol$) with density of 1.21 g/mL, what molarity of solution should the experimenter use?

<p>3.4M (C)</p> Signup and view all the answers

Which of the following operations would best increase the solubility of a gas in a liquid?

<p>Decrease pressure and increase temperature (A)</p> Signup and view all the answers

A solution is made by dissolving 30.0 g of $CuSO_4$ in enough water to make 250ml of solution. What is the concentration, M (Molarity)?

<p>0.75 M (B)</p> Signup and view all the answers

Which of the following is the correct formula for calculating weight percent (wt%)?

<p>$\frac{mass , of , solvent}{mass , of , solution} \times 100$ (B)</p> Signup and view all the answers

You need to prepare 600 grams of a saline solution with a weight percent of 15% NaCl. How many grams of NaCl are required?

<p>60 grams (C)</p> Signup and view all the answers

What is the weight/volume percent (w/v%) of a solution containing 15 grams of solute in 300 mL of solution?

<p>10% (B)</p> Signup and view all the answers

To prepare 500 mL of a 8% w/v solution of KCl, how many grams of KCl are needed?

<p>40 grams (D)</p> Signup and view all the answers

What is the volume/volume percent (v/v%) of a solution made by mixing 40 mL of ethanol with enough water to make 800 mL of solution?

<p>20% (B)</p> Signup and view all the answers

If a solution is prepared by diluting 20 mL of solute to a total volume of 400 mL, what is the volume percent concentration?

<p>5% (B)</p> Signup and view all the answers

What is the molarity of a solution containing 3.0 moles of solute in 500 mL of solution?

<p>15.0 M (C)</p> Signup and view all the answers

How many moles of $CaCl_2$ are needed to prepare 250 mL of a 2.0 M $CaCl_2$ solution?

<p>0.5 moles (B)</p> Signup and view all the answers

If 11.7 grams of NaCl (molar mass = 58.5 g/mol) are dissolved in enough water to make 200 mL of solution, what is the molarity of the solution?

<p>2.0 M (C)</p> Signup and view all the answers

What is the formula to calculate the grams of solute to add to solution?

<p>$Grams= M<em>L</em>(Molar Mass)$ (C)</p> Signup and view all the answers

What is the molality of a solution made by dissolving 4 moles of solute in 2000 grams of solvent?

<p>0.5 m (B)</p> Signup and view all the answers

What is the molality of a solution containing 18.0 g of glucose (molar mass = 180 g/mol) dissolved in 400 g of water?

<p>0.25 m (B)</p> Signup and view all the answers

If you have a 3.0 m solution, how many kilograms of solvent are needed to dissolve 1.5 moles of solute?

<p>3.0 kg (A)</p> Signup and view all the answers

You need to dilute a 25.0 mL of 3.0 M stock solution of HCl to a final volume of 500 mL. What is the molarity of the diluted solution?

<p>0.75 M (A)</p> Signup and view all the answers

If you dilute 100 mL of a 4.0 M solution to a final volume of 800 mL, what is the new molarity of the solution?

<p>4.0 M (A)</p> Signup and view all the answers

To prepare 200 mL of a 0.5 M NaCl solution from a 4.0 M stock solution, what volume of the stock solution is required?

<p>160 mL (B)</p> Signup and view all the answers

What is the first step in figuring out the grams you need when you have a volume to dilute?

<p>Figure out the New Volume (A)</p> Signup and view all the answers

Which of the following does solvation of solute require?

<p>Breaking intermolecular bonds in the solvent only (C)</p> Signup and view all the answers

Which of the following is NOT a type of solution?

<p>Solid (D)</p> Signup and view all the answers

Which of the following statements is true of particles in solution?

<p>Particles will settle overtime (C)</p> Signup and view all the answers

Which of the following is an example of a liquid/liquid solution?

<p>Humid air (C)</p> Signup and view all the answers

Which mixture type exhibits the Tyndall effect?

<p>Solutions (D)</p> Signup and view all the answers

In what type of mixture do the particles settle out of the mixture if left standing?

<p>Solutions (C)</p> Signup and view all the answers

Which action would likely improve the rate of dissolution of a solid solute in a liquid solvent?

<p>Increasing the surface area of the solute (C)</p> Signup and view all the answers

Consider the following scenario: A substance dissolves slowly in water, the resulting mixture appears cloudy, and the solute does not settle out over time. Which type of mixture is most likely formed?

<p>Colloid (C)</p> Signup and view all the answers

What is the crucial distinction between a saturated and supersaturated solution at a given temperature?

<p>A saturated solution is more stable. (D)</p> Signup and view all the answers

What is the relationship between pressure and solubility that describes gases and liquids?

<p>Solubility decreases as pressure increases. (D)</p> Signup and view all the answers

Which action will cause a supersaturated solution to rapidly precipitate?

<p>Adding a seed crystal of the solute (B)</p> Signup and view all the answers

When comparing a solution to a colloid, which property would the solution always have?

<p>Homogenous Appearnace (C)</p> Signup and view all the answers

During solution formation, energy changes occur. Which statement accurately describes the energy changes during dissolution?

<p>Endothermic reactions, energy is released. (C)</p> Signup and view all the answers

Consider the following scenario: a scientist adds a solid solute to a liquid solvent and observes that the beaker becomes colder. Which statement BEST describes the dissolution process?

<p>The dissolution is endothermic, and the energy is absorbed from the surroundings. (B)</p> Signup and view all the answers

Which of the following describes a process that increases the solubility of a solid in a liquid?

<p>An increase in temperature (B)</p> Signup and view all the answers

Given a solution of copper sulfate in water, how would you correctly prepare a more dilute solution?

<p>Add more copper sulfate (C)</p> Signup and view all the answers

What is the effect of adding more solvent to pre-existing solution?

<p>The solution becomes saturated. (C)</p> Signup and view all the answers

A student needs to prepare 500.0 mL of a 0.150 M solution of potassium hydroxide (KOH) from a 1.00 M stock solution. If the student adds 60.0 mL of the stock solution to a 500.0 mL volumetric flask, what should the student do next?

<p>Continue adding stock of potassium hydroxide until you see solid at bottom of flask (B)</p> Signup and view all the answers

Which of the following best describes the role of 'like dissolves like' in predicting solubility?

<p>Ionic and polar solutes dissolve best in polar solvents. (B)</p> Signup and view all the answers

A chemist adds a small amount of solid NaCl to water and stirs. All the salt dissolves, and more salt can be added and dissolved. Now, the chemist adds a tiny crystal of NaCl, and a large amount of solid immediately precipitates out of the solution. Before adding the crystal, the solution was...

<p>Supersaturated (C)</p> Signup and view all the answers

Which of the following is an example of a solid solution?

<p>Tooth filling amalgalm (mercury and silver) (C)</p> Signup and view all the answers

Which of the following best describes a liquid foam?

<p>Liquid dispersed in a Gas (C)</p> Signup and view all the answers

A student performs an experiment to determine how well different salts dissolve in water. They measure dissolving rates of different salts. Which property directly affect the dissolving rate?

<p>The volume of the water used. (B)</p> Signup and view all the answers

A scientist observes a mixture scattering the light, but the mixture does not settle. What are the conclusion from this information?

<p>Colloid (C)</p> Signup and view all the answers

What is the molality of a solution prepared by dissolving 25.0 g of $CuSO_4 \cdot 5H_2O$ (molar mass = 249.7 g/mol) in 250.0 g of water?

<p>0.2 m (D)</p> Signup and view all the answers

Consider a scenario where an aqueous solution of $KNO_3$ is prepared at 80C using 85 grams of $H_2O$. Upon cooling to 25C, the solution remains clear with no precipitate observed. What does this observation indicate regarding the solution at 25C?

<p>No conclusion can be made about solution saturation (B)</p> Signup and view all the answers

A researcher is preparing a buffer solution and requires precisely 500 mL of a 0.25 M Tris-HCl buffer at pH 8.0. However, she only has a 2.0 M Tris-HCl stock solution. To what volume would volume must she dilute this solution to reach the correct molarity?

<p>62.5 mL (B)</p> Signup and view all the answers

Which of the following must be true for a mixture to be classified as a solution?

<p>It must have visible particles. (B)</p> Signup and view all the answers

In a solution of glucose dissolved in water, what is the solute?

<p>The solution itself (B)</p> Signup and view all the answers

Which of the following scenarios describes a solution where a solid is dissolved in a solid?

<p>Carbon dioxide in water (C)</p> Signup and view all the answers

According to kinetic molecular theory, increasing the temperature of a solvent affect the properties of a solute?

<p>Neutralizes attractive forces between solute and solvent. (A)</p> Signup and view all the answers

Which term describes two substances that do not mix to form a homogenous solution, regardless of the proportions?

<p>Miscible (C)</p> Signup and view all the answers

What effect does increased pressure have on the solubility of gases in liquids?

<p>Decreases the solubility. (C)</p> Signup and view all the answers

Which factor, if changed, would NOT directly affect the rate at which a solute dissolves in a solvent?

<p>Surface area of the solute (C)</p> Signup and view all the answers

Which of the following describes a 'dilute' solution?

<p>A solution that cannot dissolve any more solute. (B)</p> Signup and view all the answers

Which term describes a solution that contains more solute than it can theoretically hold at a given temperature and is unstable?

<p>Supersaturated (C)</p> Signup and view all the answers

A solution is prepared by mixing 30.0 g of $CuSO_4$ in enough water to make 250 mL of solution. What is the concentration in M (Molarity) if you have a molar mass of 159.62?

<p>3.00M (A)</p> Signup and view all the answers

Which formula correctly expresses weight percent (wt%)?

<p>wt% = (moles of solute / liters of solution) x 100 (B)</p> Signup and view all the answers

To prepare 600 grams of a saline solution with a weight percent of 15% NaCl, how many grams of NaCl are required?

<p>60 grams (D)</p> Signup and view all the answers

If 15 grams of solute are present in 300 mL of solution, what is the weight/volume percent (w/v%)?

<p>2% (B)</p> Signup and view all the answers

A solution is made by mixing 40 mL of ethanol with enough water to make 800 mL of solution. What is the volume/volume percent (v/v%) of this solution?

<p>20% (B)</p> Signup and view all the answers

If 20 mL of solute is diluted to a total volume of 400 mL, what is the volume percent concentration?

<p>20% (A)</p> Signup and view all the answers

What is the molarity of solution where 3.0 moles of solute are dissolved in 500 mL of solution?

<p>0.6 M (C)</p> Signup and view all the answers

How many grams of solute is needed to add to solution to prepare mL of solution?

<p>Molarity= (B)</p> Signup and view all the answers

Calculate the molality of a solution containing 18.0 g of glucose (molar mass = 180 g/mol) dissolved in 400 g of water.

<p>1.00 m (B)</p> Signup and view all the answers

How many kilograms of solvent are needed to dissolve 1.5 moles of solute to create a 3.0 m solution?

<p>0.5 kg (A)</p> Signup and view all the answers

25.0 mL of 3.0 M stock solution of HCl to a final volume of 500 mL. What is the molarity of the diluted solution?

<p>0.25 M (B)</p> Signup and view all the answers

What volume of a 4.0 M stock solution is required to prepare 200 mL of a 0.5 M NaCl solution?

<p>10 mL (B)</p> Signup and view all the answers

To prepare 250.0 mL of a 0.200 M solution using a volumetric flask, what mass of potassium nitrate ($KNO_3$) is needed?

<p>20.22 g (B)</p> Signup and view all the answers

You have two solutions of copper sulfate ($CuSO_4$). Solution A is $. 5 M$ and Solution B is $2.0 M$. Which solution is more concentrated, and by what factor?

<p>Solution B is more concentrated by a factor of 4. (B)</p> Signup and view all the answers

The formula to find how many Liters for the molarity of a solution is:

<p>Moles of solute/ Liter of solution= Molarity (A)</p> Signup and view all the answers

If you have a 12.0 M stock solution of HCl, how many mL are needed to prepare 500 mL of a 0.500 M solution?

<p>19.4 mL (A)</p> Signup and view all the answers

What is the process of slowly adding a solution to unknown concentration to a solution with already known concentration to determine the concentration of the unknown solution?

<p>Decantation (A)</p> Signup and view all the answers

Which action would likely improve the rate of dissolution of a solid solute in a liquid solvent MOST efficiently?

<p>Cooling the solvent without stirring. (C)</p> Signup and view all the answers

Which of the following is true regarding to particles in a solution?

<p>The particles needs to be large to be visible (A)</p> Signup and view all the answers

Which selection is the correct grams needed per kilograms of solvent?

<p>Molality = moles of solute / kg of solvent (B)</p> Signup and view all the answers

An experimenter adds particles in water and results in no settling of the solution. When a beam of light is shone through it, the beam is visable, what can be deducted from this series of tests?

<p>Can Be Colloid or Suspension (B)</p> Signup and view all the answers

Which of the following is a main requirement of solvation of a solute?

<p>No Interactions happen (A)</p> Signup and view all the answers

Which factor increases the solubility of MOST solid solutes in liquid solvents?

<p>Increasing the pressure (A)</p> Signup and view all the answers

A substance dissolves slowly in water, the resulting mixture appears cloudy, and the solute does not settle out over time. Which type of mixture is most likely formed?

<p>Suspension (B)</p> Signup and view all the answers

What best tells you the relationship between the solute in two solutions.

<p>A supersaturated solution is stable, therefore it can dissolve completely. (B)</p> Signup and view all the answers

If you shine an intense light through a colloid or suspension, this is otherwise know as?

<p>Tyndall Effect (C)</p> Signup and view all the answers

What happens if there is a presence of crystal impurities in a supersaturated solution?

<p>Solution cause the crystal to dissolve. (C)</p> Signup and view all the answers

The Tyndall effect of a solution compared to a colloid will:

<p>Tyndall effect will not be visable (B)</p> Signup and view all the answers

How does energy change in a solution formation?

<p>Energy is absorved when intermolecular reactions are broken down. (C)</p> Signup and view all the answers

What is an endothermic reaction that involves solute and solve as result of reaction.

<p>Temperature becomes constant. (B)</p> Signup and view all the answers

What action, if changed, decrease the solubility of a solid dissoliving into a liquid?

<p>Increasing pressure (B)</p> Signup and view all the answers

Why does adding more solvent, creates a more diluted solution?

<p>The pressure will cause an equilibrium (C)</p> Signup and view all the answers

Which of the following options correctly identifies the solute and solvent in brass?

<p>Solute: Copper, Solvent: Gold (B)</p> Signup and view all the answers

What is the term for the measure of how easily a solute dissolves in a solvent?

<p>Molarity (B)</p> Signup and view all the answers

Which of the following is an example of a substance with high solubility in water?

<p>Oil (C)</p> Signup and view all the answers

What is the correct term used to describe when two substances are able to mix in any proportion?

<p>Immiscible (B)</p> Signup and view all the answers

Which factor does NOT directly affect the rate at which a substance dissolves?

<p>Temperature (C)</p> Signup and view all the answers

According to the provided information, how does the nature of a solvent affect the solubility of different solutes?

<p>Non-polar solvents dissolve polar solutes better. (C)</p> Signup and view all the answers

Which of the following statements best describes the effect of temperature on the solubility of solid solutes in a liquid solvent?

<p>Increasing temperature always decreases solubility. (C)</p> Signup and view all the answers

How does increasing the pressure affect the solubility of a gas in a solvent?

<p>Causes the gas to react with the solvent instead of dissolving. (D)</p> Signup and view all the answers

Which is NOT a factor that affects the rate at which substances dissolve?

<p>Volume (C)</p> Signup and view all the answers

Which of the following describes an unsaturated solution?

<p>Contains more solute than it can theoretically hold. (D)</p> Signup and view all the answers

A solution is considered saturated when it:

<p>Contains less solute than it can theoretically hold. (D)</p> Signup and view all the answers

What is a key factor when classifying concentrations?

<p>Type of solute dissolved. (C)</p> Signup and view all the answers

What term describes a condition where a solution contains more solute than it can theoretically hold?

<p>Supersaturated (C)</p> Signup and view all the answers

What is the formula to find weight percent?

<p>$\frac{grams\ of\ solution}{grams\ of\ solute} *100 $ (A)</p> Signup and view all the answers

Calculate the weight percent of a solution containing 2.25g of NaCl dissolved in 7.45g of $H_2O$

<p>2.4% (A)</p> Signup and view all the answers

If you dissolve 10 grams of sugar in 100 grams of water, what is the weight percentage of the solution?

<p>10% (C)</p> Signup and view all the answers

To make 500 grams of a 10% (wt%) solution of NaCl, how much NaCl is needed?

<p>10g (C)</p> Signup and view all the answers

What formula is correct for calculating weight/volume percent?

<p>$\frac{milliliters\ of\ solution}{grams\ of\ solute}*100$ (A)</p> Signup and view all the answers

What is the weight/volume % of a solution, if there are 5 grams of solute dissolved in 250 milliliters of solution?

<p>25% (C)</p> Signup and view all the answers

Which of the following formulas best expresses Volume Percent?

<p>$\frac{Volume\ of\ Solute}{Volume\ of\ Solvent}*100$ (C)</p> Signup and view all the answers

What is the total solution volume of a 5% solution, if there is 10ml of solute?

<p>500ml (C)</p> Signup and view all the answers

What is the key measurement to calculate Molarity?

<p>Moles of solute per kilogram of solution (B)</p> Signup and view all the answers

A solution contains 5.5 g of HCl (molar mass = 36.5 g/mol) dissolved in enough water to make 250 mL of solution. What is the molarity of the solution?

<p>0.6 M (A)</p> Signup and view all the answers

Calculate the molality of 25.0 grams of KBr dissolved in 750.0 mL of pure water

<p>0.28 m (B)</p> Signup and view all the answers

When diluting a solution, which value remains the same?

<p>Volume of solution (D)</p> Signup and view all the answers

Which of the following is the correct formula for dilutions?

<p>$M_1M_2 = V_1V_2$ (B)</p> Signup and view all the answers

Which type of the following is NOT a type of solution mixture?

<p>Liquid (D)</p> Signup and view all the answers

What is the solute in carbonated water?

<p>Nitrogen (B)</p> Signup and view all the answers

True or False: Separating liquid solutions can only occur by evaporation rather than filtration.

<p>True (A)</p> Signup and view all the answers

What are alloys known for having higher resistance to than normal metals?

<p>Melting (C)</p> Signup and view all the answers

How does particle size vary among solutions, colloids, and suspensions?

<p>Suspensions &gt; Colloids &gt; Solutions (B)</p> Signup and view all the answers

Which type of mixture separates or settles?

<p>Suspensions (B)</p> Signup and view all the answers

Which property is exclusive to colloids?

<p>Particles can be filtered. (C)</p> Signup and view all the answers

What name is given to solids mixed inside of liquid?

<p>Solid Foam (D)</p> Signup and view all the answers

Which of the following cannot be filtered due to it being extremely small?

<p>Emulsion (A)</p> Signup and view all the answers

When observing light shone through a mixture, light cannot pass through the solution. Which of the following is it?

<p>Solution (B)</p> Signup and view all the answers

Which of the following will only separate by evaporation?

<p>Tyndall Effect (A)</p> Signup and view all the answers

Which of the following will occur from increasing the surface are of a solute?

<p>The solute will have increased the dissolving ability (C)</p> Signup and view all the answers

An aqueous solution of $KNO_3$ is prepared at 80C using 85 grams of $H_2O$. Upon cooling to 25C, the solution remains clear with no precipitate observed.

<p>The solution is saturated at 25C. (B)</p> Signup and view all the answers

In a solution, what is the component that dissolves the other substance?

<p>The solvent (B)</p> Signup and view all the answers

According to the graphic, which of the examples correctly identifies the solute vs. solvent?

<p>Brass -- Solute: Zinc, Solvent: Copper (A)</p> Signup and view all the answers

Which of the following statements accurately describes 'high' solubility?

<p>The solute dissolves quickly and easily in the solvent. (B)</p> Signup and view all the answers

What typically happens when two 'immiscible' substances are combined?

<p>They form a homogenous solution. (B)</p> Signup and view all the answers

Which of the following is NOT a factor that directly affects the rate at which a substance dissolves?

<p>Agitation (D)</p> Signup and view all the answers

Based on the image, what is the relationship between the polarity of a substance and its solubility?

<p>There is no relationship between polarity and solubility. (C)</p> Signup and view all the answers

According to the images, how does increasing temperature generally affect the solubility of solid solutes in liquid solvents?

<p>It decreases the solubility. (D)</p> Signup and view all the answers

According to the image, what effect does increasing pressure have on the solubility of a gas in a liquid solvent?

<p>It increases the solubility. (B)</p> Signup and view all the answers

Which of the factors does NOT affect the rate at which a substance dissolves?

<p>Surface Area (C)</p> Signup and view all the answers

Which descriptor is associated with a solution containing only a small amount of solute?

<p>Saturated (B)</p> Signup and view all the answers

Which term refers to a solution that is still capable of dissolving more of a solute?

<p>Saturated (C)</p> Signup and view all the answers

What is the formula for calculating weight percent?

<p>$wt% = \frac{mass \ of \ solute}{total \ mass \ of \ solution} \times 100$ (C)</p> Signup and view all the answers

What calculation would you use to find the weight percentage of sodium chloride in a solution made by dissolving 2.25g of NaCl in 7.45g of $H_20$?

<p>$7.45g / (2.25 + 7.45) \times 100$ (A)</p> Signup and view all the answers

What is the weight percentage of a solution if you dissolve 10 grams of sugar in 100 grams of water to yield a total mass of 110 grams?

<p>9.09% (A)</p> Signup and view all the answers

How much NaCl is needed to make 500 grams of a 10% weight/weight (w/w) solution?

<p>50 grams (B)</p> Signup and view all the answers

What is the formula to use when calculating weight/volume percent?

<p>$w/v% = \frac{grams \ of \ solution}{milliliters \ of \ solute} \times 100$ (A)</p> Signup and view all the answers

Percent volume is the that is the solution volume concentration that is the volume of solute divided by _______ multiplied by 100

<p>grams of solute (B)</p> Signup and view all the answers

What calculation would you use to find the total solution volume of a 5% solution of unknown solution that diluted a 10ml of solute

<p>$5/10 \times 100$ (B)</p> Signup and view all the answers

Molarity is the number of _____ of solute per liter of solution abbreviated as M.

<p>liters (B)</p> Signup and view all the answers

Molality is the number of moles of solute per _____ of solvent, abbreviated as m.

<p>Liter (C)</p> Signup and view all the answers

What is the formula for calculating the grams of solute required to prepare a solution of a specific molarity and volume, given the solute's molar mass?

<p><code>Grams of solute = (Molarity / Volume of solution (in L)) / Molar mass</code> (A)</p> Signup and view all the answers

What is the primary function of dilution in the context of solutions?

<p>To increase the amount of solute in a solution. (B)</p> Signup and view all the answers

What is the formula you would use to solve a problem with dilution

<p>$M_1V_2=M_2V_2$ (C)</p> Signup and view all the answers

Based on the information, what is the correct equation to solve the molarity if you dilute 175 mL of a 1.6 M solution of LiCl to 1.0 L?

<p>$(1.6M)(175mL) = M_2 (1.0L)$ (A)</p> Signup and view all the answers

According to the image, what is the relationship with particle size in solutions, colloids, and suspensions?

<p>Suspensions have the largest particle size, followed by colloids, then solutions. (C)</p> Signup and view all the answers

Which characterization applies to materials of solutions, colloids, and suspensions?

<p>Solutions and colloids are homogenous, whereas suspensions are heterogeneous. (C)</p> Signup and view all the answers

Based on image, are particles in suspension large or small?

<p>Variable size; the particle size varies widely in a suspension. (B)</p> Signup and view all the answers

Based on the provided information, what characteristics separates a liquid solution from filtration?

<p>Filtration can remove solute particles from it (C)</p> Signup and view all the answers

Based on the provided information of colloids, what the key properties that can be determined about colloids?

<p>Settling, molecule size between a solution and suspension, and ability to absorb light (D)</p> Signup and view all the answers

What is the phenomenon where light is scattered by particles in a colloid or suspension called?

<p>Diffraction (C)</p> Signup and view all the answers

According to the diagram, what is a characteristic of suspensions?

<p>Particles cannot be separated by filtration. (C)</p> Signup and view all the answers

According to the image, what type of solution can sterling silver be categorized as?

<p>Sterling silver is a liquid solvent and liquid solute (D)</p> Signup and view all the answers

If a solution contains 50 g of NaCl in 500 g of water, determine the mass of water that must be evaporated to increase the concentration by a factor of five times?

<p>400g (B)</p> Signup and view all the answers

A chemist mixes two solutions. What condition is necessary for the combined mixture to be classified as a solution?

<p>Density gradients are maintained (B)</p> Signup and view all the answers

Assuming the solute in question 30 is $.25 \frac{g}{mol}$, and solvent is 100 mL, what is the molality?

<p>25 m (B)</p> Signup and view all the answers

Select the statement below that is NOT true regarding the comparison of the size and properties of a colloid, solution, and suspension

<p>Suspensions have large particles and do not settle to the bottom over time (B)</p> Signup and view all the answers

Which of the following changes will always increase the solubility of a solid into a liquid, but decrease the other way?

<p>Decanting water into the solid rather than adding (C)</p> Signup and view all the answers

When preparing a buffer solution with a target pH different from that of readily available stock solutions, what consideration will the reaction be?

<p>Since buffers resist with changes of pH, use concentrated solutions in order to add more buffer capacity (C)</p> Signup and view all the answers

Flashcards

Solution

Homogenous mixture of two or more substances in a single physical state.

Solute

The part of a solution that is being dissolved, typically the lesser amount.

Solvent

The part of a solution that dissolves the solute, typically the greater amount.

Solubility

How easily a solute will dissolve in a certain solvent.

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Miscible substances

Substances that fully mix in all proportions.

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Immiscible substances

Substances that never fully mix in any proportions.

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Factors affecting dissolving rate

Properties of the solute and solvent, temperature, and pressure.

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Dilute solution

Describes a solution with only a small amount of solute.

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Concentrated solution

Describes a solution with a large amount of solute.

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Unsaturated Solution

A solution that is still capable of dissolving more of a solute.

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Saturated Solution

Solutions have dissolved the maximum possible amount of solute.

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Supersaturated Solution

Solutions that have dissolved more than the normal maximum possible amount of solute.

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Weight Percent (wt%)

Common way of expressing the concentration of a solute in a solution

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Weight/Volume Percent

Weight of solute (in grams) dissolved in a given volume of solution (in milliliters)

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Volume Percent

The volume of solute divided by volume of solution, multiplied by 100

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Molarity

The number of moles of solute per liter of solution

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Molality

The number of moles of solute per kilogram of solvent

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Dilution

Addition of solvent to decrease solute concentration; solute amount is constant

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Alloy

Mixture of metals.

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Liquid Solutions Features

The solute cannot be separated from the solvent by filtration.

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Gas Solutions

Gases or vapors dissolved in one another.

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Suspension

The particles are so large that they settle out of the solvent.

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Colloids

Particles intermediate in size between those of a suspension and a solution

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Tyndall Effect

Light is scattered by particles in a colloid or suspension, making particles visible.

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Study Notes

Solutions and Colloids

Solutions

  • A solution is a homogenous mixture of two or more substances in a single physical state.
  • Solute is the part of a solution that is being dissolved and generally the lesser in amount.
  • Solvent is the part of a solution that dissolves the solute and generally the greater in amount.
  • Saltwater is a solution, where salt is the solute and water is the solvent.
  • Lemonade is a solution, where lemon juice is the solute and water is the solvent.
  • Brass is a solution(alloy) of copper, where zinc is the solute and copper is the solvent.
  • Vinegar is a solution, where acetic acid is the solute and water is the solvent.

Solubility

  • Solubility measures how easily a solute dissolves in a solvent.
  • High solubility means the solute dissolves quickly and easily, like salt in water.
  • Low solubility means the solute takes longer to dissolve, like sand in water.

Miscible and Immiscible Substances

  • Miscible substances mix fully in all proportions, e.g., alcohol and water.
  • Immiscible substances never fully mix in any proportions, e.g., oil and water.

Factors Affecting Dissolution Rate

  • Properties of the solute and solvent affect the dissolution rate.
  • Temperature affects the rate at which a substance dissolves.
  • Pressure affects the rate at which a substance dissolves.

Nature of Solute and Solvent

  • Salt (polar solute) is more soluble in water (polar solvent) and less soluble in alcohol (non-polar solvent).
  • Iodine (non-polar solute) is less soluble in water (polar solvent) and more soluble in alcohol (non-polar solvent).

Temperature Effect Solid and Gas solutes

  • The solubility of solid solutes raises in a liquid solvent as temperature raises.
  • The solubility of gas solutes decreases in a liquid solvent as temperature raises.

Pressure Effect on Solubility

  • Increased pressure or mass of larger molecules raises the solubility of a gas in a liquid solvent.
  • Solubility of gases in water at 20°C, with 1 atm gas pressure:
    • Nitrogen (N₂) has a solubility of 0.69 x 10⁻³ M
    • Carbon monoxide (CO) has a solubility of 1.04 x 10⁻³ M
    • Oxygen (O₂) has a solubility of 1.38 x 10⁻³ M
    • Argon (Ar) has a solubility of 1.50 x 10⁻³ M
    • Krypton (Kr) has a solubility of 2.79 x 10⁻³ M

Factors Affecting Rate of Dissolution

  • Increased temperature of the solvent increases the rate of dissolution.
  • Increased surface area of the solute increases the rate of dissolution.
  • Agitation or stirring of the solution increases the rate of dissolution.
  • Higly soluble solutes dissolve more quickly than less soluble solutes in a particular solvent.

Concentration of Solutions

  • Dilution - A solution with small amount of solute
  • Concentration - A solution with large amount of solute

Qualitative Concentrations

  • Unsaturated solutions can still dissolve more solute.
  • Saturated solutions have dissolved the maximum possible amount of solute.
  • Supersaturated solutions have dissolved more than the normal maximum possible amount of solute.

Calculations

  • Important calculations include weight percent, weight/volume percent, volume %, molarity, and molality.

Weight Percent

  • Weight percent (wt%) is the mass of the solute divided by the total mass of the solution, multiplied by 100%.
  • Weight Percent = (Mass of Solute / Mass of Solution) x 100

Problem set 1 : Weight Percentage of Sodium Chloride

  • Dissolving 2.25g of NaCl in 7.45g of H2O, the weight percentage formula is % = (2.35 g / (2.35 g + 7.45 g)) x 100 = 24%.

Problem set 2 : If Sugar Dissovled in in Water

  • Dissolving 10 grams of sugar in 100 grams of water, the total mass of the solution is 110 grams and weight percent formula is = (10g / 110g) x100 = 9.09%.

Problem set 3 : How Much NaCl needed

  • Needed to make 500 grams of a 10% (wt%) solution, is calculated as 10x100% = gsolute = 50g

Weight/Volume Percent

  • Weight/volume percent is defined as the weight of solute (in grams) dissolved in a given volume of solution (in milliliters).
  • Weight volume percent is the amount of grams in ml of solution, or (weight /volume) x 100.

Problem Set 1: Calculating weight to volume

  • 5 grams of solute is dissolved in 250 milliliters of solution, using the weight to volume formula = (5/250) x 100 = 2%

Problem Set 2: Grams of Salt Needed

  • To prepare 250 milliliters of a 4% w/v solution you need the following (4/100) x (250ml solution) = grams of solute, so you need 10grams.

Volume Percent

  • Percent volume is: (volume of solute divided by volume of solution) multiplied by 100.

Problem Set 1: Total solution volume:

  • To find the total solution volume of a 5% solution of unknown solution that diluted a 10ml of solute: the calculation is 10x100 and then divided by 5 , giving a total of 200ml.

Problem Set 2: Calculating Volume of an Unkown Solution

  • With a percent of 5%, the volume will be V ol% =5.0%.

Molarity

  • Molarity is the number of moles of solute per liter of solution, abbreviated as M
  • Molarity (M) = moles solute /liters of solution

Problem Set 1: How Many Grams of NaBr

  • To figure out how grams grams of NaBr (molar mass = 102.9 g/mol)
    • Convert it to mol to g, so 0.161mol x 102.9 g/mol= 16.6 g

Problem Set 2: Calculating Molarity

  • A solution that was prepared 14.2 g of NaNO3 (molar mass = 85.0 g/mol)in enough water to make 350 mL of solution
    • Convert grams to mol, thus 14.2g/85g/mol =0.167Mol
      • Formula is 0.167Mol / 0.350 L = 0.47 M

Problem Set 3: Calculating Molarity for Solution contains 5.5 g HCL

  • Contains 5.5 g of HCI (molar mass = 36.5 g/mol)dissolved in enough water to make 250 mL of solution
    • Convert into grams, thus 5.5g / 36.5g/mol = 0.15mol
      • Final Solution (molarity) is Molarity = 0.15 mol / 0.250 L =0.6M

Molality

  • Molality is the number of moles of solute per kilogram of solvent, abbreviated as M.
  • Molality = moles of solute / kg of solvent

Problem Set 1: Calculate Molality of Solution

  • When 7.45 g of potassium chloride (KCI) was dissolved in 100 g of water. Calculate the molality of the solution.
    • Converted to grams, 7.45 g/ 74.5 g mol-1 = 0.1 mol
      • Molarity = 0.1 mol/ 0.1 L = 1 M

Problem Set 2: Calculate Molality of Solution Dissolving in pure water

  • If the you needed to calculate the molality of 25.0 grams of KBr dissolved in 750.0 mL of pure water use the following formula:
    • Convert grams to moles =25 g/ 119 g mol-1 = 0.21 mol
      • Apply the formula to solve, thus Molality = 0.21 mol / 0.75L =0.28 M

Dilution

  • Dilution is adding solvent to decrease the concentration of solute.
  • Solution volume changes, the amount of solute is constant.
  • Moles of solute (mol) = molarity (M) x volume (V)
  • M₁V₁ = M₂V₂

Problem Set 1: Diluting NaOH

  • To solve volume dilution problem fo 6.0M NaOH used to prepare 5.00L if 0.10M NaOH
    • Calculation is (6.0M) x V₁ = (0.10M)(5.00L)

Problem Set 2: Diluting LiCI, determine new concentration of solution

  • The calculation (1.6M)(175mL) = M₂ (1000mL)

Concentration of Solution

  • Molarity (M) = Moles of solute/Liter of solution = Mol/L

Solutions vs Colloid vs Suspensions

  • Soultion: Particle size less than 1 nm
  • Colloid: Particle size 1 nm to 1000 nm
  • Suspension: Particle size greater than 1000 nm

Characteristics of solutions

-Solutions is a homogeneous mixture of two or more substance in a single state

  • Are small
  • Will not separate
  • Evenly distribute

Types of Solutions

  • Solid
  • Liquid
  • Gas
  • Aqueous

Solid Solutions

  • A mixture of metals, also known as Alloys
    • Alloys are preferred over pure metals because:
      • They resist corrosion
      • They have higher melting points
      • They are stronger than pure metals
  • Bronze copper (78-95%), tin 5-22%
  • 18K Gold gold(75%), copper (12.5%), silver (12.5%)
  • Brass copper (60-90%), zinc (10-35%)
  • Cast Iron iron (96-98%), carbon (2-4%)
  • Sterling Silver silver (92.5%), copper (7.5%)

Liquid Solutions

  • The solute cannot be separated from the solvent by filtration
  • It can only be separated by evaporation of the solvent
  • The solute particles are not visibile but can produce a colored solution
  • Common examples include : liquid cleaners, liquid soap, hydrogen peroxide, disinfectants, vinegar, mouthwash.

Gas Solutions

  • Includes gases or vapors dissolved in one another.
  • Two or more gases can form a solution. Air is an example
  • Composition of Air is 78% nitrogen, 20.9 Percent oxygen, 0.17 Other gases, 0.9 percent carbon, 0.03 carbon dioxide.

Solution, Solute, Solvent Chart

  • Gaseous Solutions:
    • Gas solute in Gas solvent: Mixture of oxygen and nitrogen gases
    • Liquid solute in Gas solvent: Chloroform mixed with nitrogen gas
    • Solid solute in Gas solvent: Camphor in nitrogen gas
  • Liquid Solutions:
    • Gas solute in Liquid solvent: Oxygen dissolved in water
    • Liquide solute in Liquid solvent: Ethanol dissolved in water
    • Solid solute in Liquid solvent: Glucose dissolved in water
  • Solid Solutions:
    • Gas solute in Solid solvent: Solution of hydrogen in palladium
    • Liquid solute in Solid solvent: Amalgam of mercury with sodium
    • Solid solute in Solid solvent: Copper dissolved in gold

Review of Solutions and States

  • Solution Air; Solvent nitrogen (gas); Solute(s) other gases
  • Solution Carbonated water ; Solvent water (liquid); Solute(s) CO2 (gas)
  • Solution Saline solution; Solvent water (liquid); Solute(s) salt (solid)
  • Solution Rubbing Alcohol ; Solvent Alcohol (liquid); Solute water (liquid)
  • Solution Sterling Silver ; Solvent sliver (solid); Solute(s) copper (solid)

Suspension

  • This is where the particles are large that they settle out of the solvent if not constantly stirred.
  • Suspensions are typically opaque, cannot pass through a filter
  • Muddy water, blood, and paint, are all examples

Colloids

  • The particles intermediate in size between those of a suspension and they are able to form a solution.
  • They exhibit the Tyndall effect due to the scattering of light by the dispersed particles.
  • Examples of colloids include milk, fog, and gelatin
    • Gas: (Substance A)
      • None for (substance B)
    • Liquid
      • Liquid Aerosols (Substance A): Fog, hair sprays, Clouds (Substance B).
    • Solid
      • Solid Aerosols (substance A: Smoke, air particulates (Substance B).
    • Liquid: (Substance A)
      • Liquid Foam (substance B): Whipped cream, shaving cream
      • Emulsion (substance B): Milk, mayonnaise, hand lotion
      • Sol (substance B): Pigment ink, blood, paint
    • Solid: (Substance A)
      • Solid Foam (substance B):Stryrofoam, pumice
      • Gel (substance B): Gelatin, jelly
      • Solid Sol (substance B): Cranberry glass

Tyndall Effect

  • It is the phenomenon where light is scattered by particles in a colloid or suspension, causing the particles to become visible.

Mixtures Overview:

  • Can be Separated:
  • Distillation separates mixtures.
  • Solution Composition:
  • Made of a solute dissolved in a solvent.
  • Particle Characteristics (Solution):
  • Particles do not settle to the bottom.
  • Particles cannot be seen.
  • Light Interaction (Solution):
  • Does not scatter light.
  • Colloid Properties:
  • Possesses properties of both solutions and suspensions.
  • Appearance (Colloid):
  • Appears homogenous but is actually heterogeneous.
  • Particle Settlement (Colloid):
  • Particles do not settle to the bottom.
  • Filtration (Colloid):
  • Particles cannot be filtered.
  • Light Interaction (Colloid):
  • Blocks or scatters light.
  • Suspension Composition:
  • Made of particles.
  • Mixture Type (Suspension):
  • Heterogeneous mixture.
  • Particle Settlement (Suspension):
  • Large particles settle to the bottom.
  • Filtration (Suspension):
  • Particles can be filtered.
  • Light Interaction (Suspension):
  • Blocks or scatters light.

Overview of Solutions, Colloids, and Suspensions

  • Particle Size:
    • Solution: Less than 1 nm.
    • Colloid: 1 to 100 nm.
    • Suspension: More than 100 nm.
  • Appearance:
    • Solution: Clear.
    • Colloid: Cloudy.
    • Suspension: Cloudy.
  • Separation:
    • Solution: Does not separate.
    • Colloid: Does not separate.
    • Suspension: Separates or settles.
  • Filterability:
    • Solution: Passes through the filter paper.
    • Colloid: Passes through the filter paper.
    • Suspension: Particles do not pass through filter paper.
  • Effect of Beam of Light:
    • Solution: Light can pass through.
    • Colloid: Scatters light.
    • Suspension: Light cannot pass through.
  • Examples:
    • Solution: Salt solution.
    • Colloid: Mayonnaise.
    • Suspension: Muddy water.

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Description

Explore the characteristics of solutions, including the roles of solute and solvent. Understand solubility, and differentiate between miscible and immiscible substances. Examples like saltwater, lemonade, and brass are discussed.

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