11.5 Colloids

11.5 Colloids/Suspensions

by Luis Bello

​Previous Class ​Colligative properties

​Learning Objectives

By the end of this section, you will be able to:

• Express concentrations of solution components using mole fraction and molality

• Describe the effect of solute concentration on various solution properties (vapor pressure, boiling point, freezing point, and osmotic pressure)

• Perform calculations using the mathematical equations that describe these various colligative effects

• Describe the process of distillation and its practical applications

• Explain the process of osmosis and describe how it is applied industrially and in nature

​

Multiple Choice

When KCl (potassium chloride) is dissolved in water, how many particles are in solution for each unit?

• 1

• 2

• 3

• 4

• 6

Multiple Choice

What type of substance dissolves in water but does not form ions or conduct electricity?

• electrolyte

• nonelectrolyte

• saturated

• insoluble

Multiple Choice

Colligative properties depend on the _____ of solute particles in solution.

• type

• number

• pH

• nature

Multiple Choice

The boiling point of a solution is ______ the boiling point of the pure solvent.

• higher than

• the same as

• lower than

• higher or lower than

Multiple Choice

The van't Hoff factor measures the number of particles formed in solution. What is the van't Hoff factor for the compound Na₂SO₄?

• 1

• 3

• 5

• 7

Multiple Choice

Adding a nonvolatile solute to a liquid will ___.

• depress both the freezing point and the boiling point

• elevate both the freezing point and the boiling point

• depress the freezing point and elevate the boiling point

• elevate the freezing point and depress the boiling point

Multiple Choice

What mass of water is needed to dissolve 34.8 g of copper(II) sulfate in order to prepare a 0.521 m solution?

• 0.418

• 0.419

• 0.420

• 0.421

Multiple Choice

Calculate the freezing point of a solution made from 32.7 g of propane, C3H8, dissolved in 137.0 g of benzene, C6H6. The freezing point of benzene is 5.50° C and its Kf is 5.12° C/m.

• -22.2° C

• -22.3° C

• -22.4° C

• -22.5° C

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