Podcast
Questions and Answers
What is the approximate percentage of dissolved solids in seawater?
What is the approximate percentage of dissolved solids in seawater?
- 3.5% (correct)
- 35%
- 0.35%
- 96.5%
Which of these ions is significantly more abundant in blood than in seawater?
Which of these ions is significantly more abundant in blood than in seawater?
- Hydrogen carbonate ($HCO_3^−$) (correct)
- Sulfate ($SO_4^{2−}$)
- Chloride ($Cl^−$)
- Sodium ($Na^+$)
Why is extracting gold from seawater considered unfeasible?
Why is extracting gold from seawater considered unfeasible?
- The concentration of gold in seawater is extremely low. (correct)
- The presence of other ions interferes with gold extraction.
- The technology required for extraction is not yet developed.
- Gold reacts with other elements in seawater, forming stable compounds.
In a solution of sugar and water, what determines which substance is the solvent?
In a solution of sugar and water, what determines which substance is the solvent?
Which of the following best describes a 'dilute' solution?
Which of the following best describes a 'dilute' solution?
What term describes a solution that contains more solute than it can theoretically hold at a given temperature?
What term describes a solution that contains more solute than it can theoretically hold at a given temperature?
According to the principle 'like dissolves like', which solvent is iodine ($I_2$) more likely to dissolve in?
According to the principle 'like dissolves like', which solvent is iodine ($I_2$) more likely to dissolve in?
What is the correct formula for calculating molarity (M)?
What is the correct formula for calculating molarity (M)?
If you have 0.500 L of solution containing 0.24 mol of NaOH, what is the molarity of the solution?
If you have 0.500 L of solution containing 0.24 mol of NaOH, what is the molarity of the solution?
To prepare a solution of a specific molarity from a solid solute, what is the first step?
To prepare a solution of a specific molarity from a solid solute, what is the first step?
How is molality (m) defined?
How is molality (m) defined?
A metal piece contains 87.9 g of Fe in a 113 g sample. What is the mass percentage of Fe in the metal?
A metal piece contains 87.9 g of Fe in a 113 g sample. What is the mass percentage of Fe in the metal?
What is the concentration of Pb in parts per thousand (ppth) if 0.6 g of Pb is present in 277 g of solution?
What is the concentration of Pb in parts per thousand (ppth) if 0.6 g of Pb is present in 277 g of solution?
If a solution of $CaCl_2$ is labeled as 1 M, what is the concentration of $Cl^−(aq)$ in the solution?
If a solution of $CaCl_2$ is labeled as 1 M, what is the concentration of $Cl^−(aq)$ in the solution?
Which process involves decreasing the concentration of a solute in a solution by adding more solvent?
Which process involves decreasing the concentration of a solute in a solution by adding more solvent?
In the dilution equation ($M_1V_1 = M_2V_2$), what quantity remains constant before and after the change in concentration?
In the dilution equation ($M_1V_1 = M_2V_2$), what quantity remains constant before and after the change in concentration?
A 2.19 M solution with an initial volume of 25.0 mL is diluted to 72.8 mL. What is the final concentration?
A 2.19 M solution with an initial volume of 25.0 mL is diluted to 72.8 mL. What is the final concentration?
What is the primary use of concentration as a conversion factor in stoichiometry problems?
What is the primary use of concentration as a conversion factor in stoichiometry problems?
If you need to determine the mass of NaOH present in 0.765 L of 1.93 M NaOH, what additional information do you require?
If you need to determine the mass of NaOH present in 0.765 L of 1.93 M NaOH, what additional information do you require?
What is the purpose of performing a titration experiment?
What is the purpose of performing a titration experiment?
What are colligative properties dependent on?
What are colligative properties dependent on?
What is the range of possible values for mole fraction?
What is the range of possible values for mole fraction?
A solution contains 12.0 g of $C_{10}H_8$ in 45.0 g of $C_6H_6$. What is the mole fraction of $C_{10}H_8$?
A solution contains 12.0 g of $C_{10}H_8$ in 45.0 g of $C_6H_6$. What is the mole fraction of $C_{10}H_8$?
What colligative property is described by Raoult's law?
What colligative property is described by Raoult's law?
How does the addition of a nonvolatile solute affect the boiling point of a solution?
How does the addition of a nonvolatile solute affect the boiling point of a solution?
Which of the following is the correct formula for calculating boiling point elevation?
Which of the following is the correct formula for calculating boiling point elevation?
What is the effect of solute particles on the freezing point of a solution?
What is the effect of solute particles on the freezing point of a solution?
What is the definition of a semipermeable membrane?
What is the definition of a semipermeable membrane?
What is the driving force behind osmosis?
What is the driving force behind osmosis?
Which of the following is the correct formula for calculating osmotic pressure?
Which of the following is the correct formula for calculating osmotic pressure?
Why should intravenous fluids have approximately the same osmotic pressure as blood serum?
Why should intravenous fluids have approximately the same osmotic pressure as blood serum?
Why is drinking seawater dangerous?
Why is drinking seawater dangerous?
What is the van't Hoff factor ($i$)?
What is the van't Hoff factor ($i$)?
Which of these compounds would you expect to have the largest van't Hoff factor in an aqueous solution?
Which of these compounds would you expect to have the largest van't Hoff factor in an aqueous solution?
In practice, why is the actual van't Hoff factor often less than the ideal van't Hoff factor?
In practice, why is the actual van't Hoff factor often less than the ideal van't Hoff factor?
How does the inclusion of the van't Hoff factor modify the freezing point depression formula?
How does the inclusion of the van't Hoff factor modify the freezing point depression formula?
Is the common culinary practice of adding a small amount of salt to water purportedly to raise its boiling point scientifically sound?
Is the common culinary practice of adding a small amount of salt to water purportedly to raise its boiling point scientifically sound?
Consider two separate aqueous solutions with equal molalities: one with NaCl and the other with $CaCl_2$. If all other factors are identical, which solution exhibits the lower vapor pressure and why? Assume complete disassociation.
Consider two separate aqueous solutions with equal molalities: one with NaCl and the other with $CaCl_2$. If all other factors are identical, which solution exhibits the lower vapor pressure and why? Assume complete disassociation.
Imagine you're stranded on a (deserted fictional) island, with access to a lab containing tons of random chemicals. You're dehydrated and need drinking water. You have a large container of seawater. There are two processes you could use to obtain pure drinking water from it. Process 1: Boil the seawater and collect the condensed water. Process 2: Use reverse osmosis, applying high pressure to push water through a semipermeable membrane, separating it from the salt. Considering that all seawater and end-product water produced will eventually drain back into the island's water table (and eventually back into the ocean due to a crack in the island's rock bed), which would have the least impact on the long run drinkability on the the island, assuming both processes produce the same amount of drinking water?
Imagine you're stranded on a (deserted fictional) island, with access to a lab containing tons of random chemicals. You're dehydrated and need drinking water. You have a large container of seawater. There are two processes you could use to obtain pure drinking water from it. Process 1: Boil the seawater and collect the condensed water. Process 2: Use reverse osmosis, applying high pressure to push water through a semipermeable membrane, separating it from the salt. Considering that all seawater and end-product water produced will eventually drain back into the island's water table (and eventually back into the ocean due to a crack in the island's rock bed), which would have the least impact on the long run drinkability on the the island, assuming both processes produce the same amount of drinking water?
Flashcards
Solvent
Solvent
The major component of a solution.
Solute
Solute
The minor component of a solution.
Dilute
Dilute
Describes a solution with very little solute.
Concentrated
Concentrated
Signup and view all the flashcards
Solubility
Solubility
Signup and view all the flashcards
Saturated solution
Saturated solution
Signup and view all the flashcards
Unsaturated solution
Unsaturated solution
Signup and view all the flashcards
Supersaturated solution
Supersaturated solution
Signup and view all the flashcards
"Like Dissolves Like"
"Like Dissolves Like"
Signup and view all the flashcards
Molarity (M)
Molarity (M)
Signup and view all the flashcards
Molality (m)
Molality (m)
Signup and view all the flashcards
Mass Percentage
Mass Percentage
Signup and view all the flashcards
Parts per Thousand (ppth)
Parts per Thousand (ppth)
Signup and view all the flashcards
Parts per Million (ppm)
Parts per Million (ppm)
Signup and view all the flashcards
Parts per Billion (ppb)
Parts per Billion (ppb)
Signup and view all the flashcards
Dilution
Dilution
Signup and view all the flashcards
Concentration (of a Solution)
Concentration (of a Solution)
Signup and view all the flashcards
Dilution Equation
Dilution Equation
Signup and view all the flashcards
Colligative properties
Colligative properties
Signup and view all the flashcards
Mole Fraction
Mole Fraction
Signup and view all the flashcards
Vapor pressure
Vapor pressure
Signup and view all the flashcards
Vapor Pressure Depression
Vapor Pressure Depression
Signup and view all the flashcards
Raoult's Law
Raoult's Law
Signup and view all the flashcards
Normal boiling point
Normal boiling point
Signup and view all the flashcards
Boiling Point Elevation
Boiling Point Elevation
Signup and view all the flashcards
Change in Boiling Point (ΔTb)
Change in Boiling Point (ΔTb)
Signup and view all the flashcards
Freezing point
Freezing point
Signup and view all the flashcards
Freezing Point Depression
Freezing Point Depression
Signup and view all the flashcards
Change in Freezing Point (ΔTf)
Change in Freezing Point (ΔTf)
Signup and view all the flashcards
Semipermeable membrane
Semipermeable membrane
Signup and view all the flashcards
Osmosis
Osmosis
Signup and view all the flashcards
Osmotic pressure (Î )
Osmotic pressure (Î )
Signup and view all the flashcards
Osmotic Pressure Equation
Osmotic Pressure Equation
Signup and view all the flashcards
van't Hoff factor (i)
van't Hoff factor (i)
Signup and view all the flashcards
Freezing Point Depression (with i)
Freezing Point Depression (with i)
Signup and view all the flashcards
Boiling Point Elevation (with i)
Boiling Point Elevation (with i)
Signup and view all the flashcards
Osmotic Pressure (with i)
Osmotic Pressure (with i)
Signup and view all the flashcards
Study Notes
- Seawater, essential for life on Earth, is primarily H2O with about 3.5% dissolved solids, mainly NaCl and other ions.
- Bodily fluids, like blood, resemble seawater, with most ions more abundant in seawater than in blood.
- Blood contains significantly more hydrogen carbonate ion (HCO3−) than seawater, playing a crucial role in controlling blood's acid-base properties.
- Blood has a small amount of hydrogen phosphate ions (HPO42− and H2PO4−), which affect acid-base properties, while seawater has negligible amounts.
- Blood has a negligible amount of the sulfate ion (SO42−), but this ion is present in seawater.
- Gold exists in seawater in trace amounts (1 part per 1 × 10^13 parts of seawater), making extraction unfeasible, but totaling about 1.4 × 10^14 g in the world's oceans.
- A solution is a homogeneous mixture behaving like a single substance, where the major component is the solvent and the minor component is the solute.
- Solutions can exist in any phase, with the overall phase matching the solvent's phase.
- Concentration describes the amount of solute in a solvent, with dilute indicating little solute and concentrated indicating a lot.
- Solubility is the maximum amount of solute that can dissolve in 100 g of solvent at a given temperature.
- A solution is saturated when it contains the maximum amount of solute, and unsaturated when it contains less.
- Supersaturated solutions contain more solute than normally possible, achieved by heating and cooling carefully, but are unstable.
- "Like dissolves like" predicts solute solubility based on intermolecular forces matching the solvent's. "Like dissolves like" is a general rule, not an absolute statement, for predicting whether a solute is soluble in a given solvent.
- Molarity (M) is the number of moles of solute per liter of solution, expressed as M = moles of solute / liters of solution.
- Molality (m) is the number of moles of solute per kilogram of solvent.
- Mass percentage is calculated as (mass of component / total mass) × 100.
- Parts per thousand (ppth) = (mass of solute / mass of solution) × 1000.
- Parts per million (ppm) = (mass of solute / mass of solution) × 10^6.
- Parts per billion (ppb) = (mass of solute / mass of solution) × 10^9.
- For ionic solutions, ion concentration differs from salt concentration due to dissociation.
- For example, 1 M CaCl2 yields 2 M Cl−(aq).
- Total ion concentration is the sum of individual ion concentrations.
- For example, 1 M NaCl has a total ion concentration of 2 M.
- Dilution is adding solvent to decrease concentration, while concentration is removing solvent to increase concentration.
- In both, the amount of solute remains constant.
- The dilution equation is M1V1 = M2V2, where M is molarity and V is volume.
- In concentrating solutions, the dilution equation is used because the amount of solute remains constant.
- Molarity can be a conversion factor between the amount of solute and the amount of solution or solvent.
- Concentrations can be used in stoichiometry problems, using the definition of the concentration unit as a conversion factor.
- Concentrations can be used to relate quantities of one solution to quantities of another solution in balanced chemical equations.
- Colligative properties of solutions depend on the number of solute particles, not their identity.
- Mole fraction (χi) is the number of moles of a component divided by the total number of moles in the sample.
- The sum of mole fractions of all substances in a mixture equals 1.
- Vapor pressure depression is the lowering of a solution's vapor pressure compared to the pure solvent.
- This is dependent on the fraction of solute particles.
- Raoult's law: Psoln = χsolv * P°solv, where Psoln is the vapor pressure of the solution, χsolv is the mole fraction of the solvent particles, and P°solv is the vapor pressure of the pure solvent.
- Boiling point elevation is the increase in a solution's boiling point compared to the pure solvent.
- The change in boiling point (ΔTb) is calculated as ΔTb = m * Kb, where m is the molality of the solution and Kb is the boiling point elevation constant.
- Freezing point depression is the decrease in a solution's freezing point compared to the pure solvent.
- The change in freezing point (ΔTf) is calculated as ΔTf = m * Kf, where m is the molality of the solution and Kf is the freezing point depression constant.
- Osmosis is the tendency for solvent molecules to move from a dilute solution to a concentrated solution through a semipermeable membrane.
- Osmotic pressure (Î ) is the pressure difference between two solutions separated by a semipermeable membrane.
- The osmotic pressure of a solution is calculated as Î = M * R * T, where M is the molarity of the solution, R is the ideal gas law constant, and T is the absolute temperature.
- Intravenous (IV) fluids need to have approximately the same osmotic pressure as blood serum to prevent cell damage.
- For ionic solutes, the van't Hoff factor (i) is the number of particles each solute formula unit breaks apart into when it dissolves.
- Revised equations to calculate the effect of ionization on colligative properties are: ΔTf = i * m * Kf, ΔTb = i * m * Kb, and Π= i * M * R * T.
- For calculating vapor pressure depression in an ionic solution using Raoult's law, the mole fraction of solvent particles must be recalculated to account for the increased number of particles formed on ionization.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.