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Properties of Solutions

Chapter 16.1

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Learning Objectives? What solubility is and how it is determined Recognize various levels of saturation and

its relationship to solutions Miscible vs Immiscible Factors that affect solubility, with special

attention to temp. Henry’s Law

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What is solubility?Solubility refers to how much of

a solute can be dissolved in solvent

Solubility is often expressed in grams of solute per 100 g of solvent (usually data tables are at temp. = 25oC)

A saturated solution contains the maximum amount of a solute that will dissolve in a given solvent at a specific temperature. (i.e. 36.2 grams of NaCl dissolved in a 100 g water)

An unsaturated solution contains less solute than the solvent has the capacity to dissolve at a specific temperature.

A supersaturated solution contains more solute than is present in a saturated solution at a specific temperature.

Types of Solutions

An heterogeneous mixture is where you add so much solute to the solvent that it “crashes out”. You can visibly see solvent.

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Miscible vs. ImmiscibleTwo liquids are miscible if they dissolve

in each other in all proportions (antifreeze)

Two liquids are immiscible if they separate into two phases (oil and water)

Liquids that are slightly soluble in each other – partially miscible (ether and H2O)

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What affects solubility?

Factors that affect solubility:1. Surface Area of solute

2. Agitation

3. Temperature

4. Pressure (for gases in aqueous solutions)

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How does temperature affect solubility?

Increased kinetic energy causes an increase in particle collisions

Solubility of most solids increases with increase in solvent temperature

Solubility of gases decreases with an increase in solvent temperature

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How does pressure affect gas solubility?

Gas solubility increases as the pressure of the gas increases

Henry’s Law:

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2

1

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P

S

P

S

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Homework for 16.1

Page 477 # 3, 6 Page 499 # 42, 43, 44, 48, 49 Page 500 # 71, 79