Solutions: Components and Classification

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Questions and Answers

Which characteristic is essential for a mixture to be classified as a solution?

  • It must appear as multiple phases.
  • It must contain visible solid particles.
  • It must be heterogeneous.
  • It must be homogeneous. (correct)

A solution is composed of solute particles dispersed throughout a solvent.

True (A)

What two components are necessary to form a solution?

solute and solvent

The classification of solutions is based on the phase of its components, ______________, and concentration.

<p>saturation</p>
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Match each type of solution with a suitable example:

<p>Liquid solution = Salt water Solid solution = Brass Gaseous solution = Air</p>
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What defines a liquid solution?

<p>A solution where the solvent is a liquid. (B)</p>
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Brine, a solution of salt in water, is an example of a liquid solution.

<p>True (A)</p>
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Besides solid solutes in liquid solvents, what are two other forms of liquid solutions?

<p>liquid solutes in liquid solvents, gas solutes in liquid solvents</p>
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Rubbing alcohol, which consists of ethanol in water, is an example of a __________ solution.

<p>liquid-liquid</p>
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In a solid solution, what state of matter is the solvent?

<p>Solid (B)</p>
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Hydrogen gas trapped in palladium metal is considered a solid solution.

<p>True (A)</p>
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What materials are combined to create the solid solution known as brass?

<p>zinc and copper</p>
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Amalgam, used in dentistry, is a solid solution of liquid __________ in solid gold.

<p>mercury</p>
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What defines a gaseous solution?

<p>A solution where the solvent is a gas. (B)</p>
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Air is an example of a gaseous solution.

<p>True (A)</p>
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Provide an example of a solid solute dissolved in a gaseous solvent.

<p>camphor in nitrogen gas</p>
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Water vapor in the air is an example of __________ dissolved in a gaseous solvent, specifically air.

<p>liquid</p>
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What factor is considered when categorizing solutions by their saturation level?

<p>The amount of solute dissolved relative to its solubility. (B)</p>
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Solubility, when classifying by saturation, is not temperature-dependent.

<p>False (B)</p>
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Under what conditions is the amount of solute less than the solute's solubility?

<p>unsaturated solution</p>
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If a solution has the maximum amount of solute dissolved in a solvent, it is said to be a __________ solution.

<p>saturated</p>
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Which of the following best describes a supersaturated solution?

<p>A solution that contains more solute than it can theoretically hold. (A)</p>
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Agitation always stabilizes a supersaturated solution.

<p>False (B)</p>
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How does temperature affect the creation of a supersaturated solution?

<p>The solute is dissolved at a higher temperature, then cooled down.</p>
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The process where excess solute comes out of a supersaturated solution is called __________..

<p>crystallization</p>
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What is the common unit to measure concentration?

<p>Molarity (M) (D)</p>
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Molarity is not a unit of concentration.

<p>False (B)</p>
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What type of solutions is often used in preparing diluted solutions?

<p>stock solutions</p>
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A solution with a molarity greater than 1 M is considered a __________ solution.

<p>concentrated</p>
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What process defines the creation of a diluted solution?

<p>Dilution (C)</p>
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Dilution increases the concentration of a solution.

<p>False (B)</p>
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What is the procedure to prepare a diluted solution?

<p>taking an aliquot and adding more solvent</p>
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The diluted portion of the stock solution is known as an __________.

<p>aliquot</p>
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Which of the following contains the SMALLEST amount of solute relative to the amount of solvent?

<p>Diluted solution (D)</p>
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A carbonated drink is an example of a liquid-liquid solution.

<p>False (B)</p>
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What solution is comprised of liquid mercury in gold?

<p>amalgam</p>
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An _______ has the same concentration as the stock solution.

<p>aliquot</p>
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Match the following types of solutions with an example:

<p>based on the phase of the solvent: air = gaseous based on concentration: 0.5 M potassium permanganate, KMnO4 = molarity based on the phase of the solvent: rubbing alcohol = liquid</p>
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Which of these options is the best example of a solvent?

<p>Water (D)</p>
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A solute is always a solid.

<p>False (B)</p>
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What type of solutions contains more solute than should be possible?

<p>supersaturated</p>
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Flashcards

Solutions

Homogeneous mixtures that appear as one phase.

Liquid solutions

A solution where the solvent is a liquid.

Solid solutions

A solution where the solvent is a solid.

Gaseous solutions

A solution where the solvent is a gas.

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Solutions Based on Saturation

Classifying solutions based on the amount of solute dissolved in a given amount of solvent at a specific temperature.

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Unsaturated Solution

A solution where the amount of solute is less than the solute's solubility at a given volume and temperature.

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Saturated Solution

A solution where the amount of solute is equal to the solute's solubility at a given volume and temperature.

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Supersaturated Solution

A solution where the amount of solute is greater than the solute's solubility at a given volume and temperature. Agitation causes crystallization.

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Solutions Based on Concentration

Classification of solutions based on the amount of solute.

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Concentrated Solution

A solution that contains an excessively large amount of solute with molarities of > 1 M.

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Diluted Solution

A solution of low concentration that is prepared through the process of dilution. Prepared by taking an aliquot or by adding more solvent.

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Solution

A homogeneous mixture of two or more pure substances

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Solute

Component present in lesser amounts in a solution.

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Solvent

The more abundant substance in a solution.

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Study Notes

  • Solutions are homogeneous mixtures appearing in a single phase
  • Solutions consist of solute particles dissolved in a suitable solvent
  • Solutions are classified by their components' phases, saturation, and concentration

Solution Components

  • A solution is a homogeneous mix of two or more pure substances
  • Solutions are composed of a solute and a solvent
  • The solute is the substance presented in smaller quantities
  • The solvent is the substance present in greater quantities

Classification by Solvent Phase

  • Solutions are classified based on the solvent's phase
  • Liquid solutions' solvent is a liquid
  • Liquid solutions are the most common type
  • Solid-liquid, liquid-liquid, and gas-liquid solutions are all types of liquid solutions
  • Solid solutions' solvent is a solid
  • Solid-solid, liquid-solid, and gas-solid solutions are all types of solid solutions
  • Gaseous solutions utilize a gas as a solvent
  • Solid-gas, liquid-gas, and gas-gas solutions are all types of gaseous solutions
Solute Solvent Resulting Solution Example
Solid Liquid Liquid Brine (salt in water)
Liquid Liquid Liquid Rubbing Alcohol
Gas Liquid Liquid Carbonated Drinks
Solid Solid Solid Brass (zinc in copper)
Liquid Solid Solid Amalgam (mercury in gold)
Gas Solid Solid Hydrogen gas in palladium
Solid Gas Gas Camphor in nitrogen gas
Liquid Gas Gas Water vapor in the air
Gas Gas Gas Air

Classification by Saturation

  • Solutions are also classified by saturation
  • Saturation depends on the amount of solute dissolved in a given solvent volume at a specific temperature
  • Solubility at a specific temperature must be considered here
  • An unsaturated solution has less solute than its solubility at a given volume and temperature
  • A saturated solution has an amount of solute that equals its solubility at a given volume and temperature
  • A supersaturated solution has more solute than its solubility at a given volume and temperature
  • Supersaturation involves dissolving a solute at a higher temperature, then cooling
  • Supersaturated solutions are unstable, agitation leads to crystallization

Solution Saturation Key Points

  • In unsaturated solutions, the amount of solute is less than the solubility capacity of the solvent
  • In saturated solutions, the amount of solute equals the solubility capacity of the solvent
  • In supersaturated solutions, the amount of solute is greater than the solubility capacity of the solvent

Classification by Concentration

  • Concentrated solutions contain an excessively large amount of solute
  • Molarity (M) is the most common unit of concentration
  • Concentrated solutions have molarities greater than 1 M
  • Stock solutions are concentrated solutions used to prepare diluted solutions
  • Concentrated sulfuric acid is 18 M, glacial acetic acid is 17 M
  • Diluted solutions have a low concentration
  • Dilution is used in preparation, involving:
    • Taking an aliquot aliquot(portion of the stock), Then
    • Adding more solvent to dilute and lower the concentration

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