$\text{Osmolarity} = \text{Molarity} \times \text{Van’t Hoff factor}$

Question 1

Which of the following statements best describes a colligative property?

Accepted Answer

A property that depends only on the number of solute particles, not their identity.

Question 2

When a non-volatile solute is added to a solvent, which of the following colligative properties will decrease?

Accepted Answer

Freezing point

Question 3

A solution is prepared by dissolving 1 mol of NaCl in water. What is the expected Van’t Hoff factor ($i$) for NaCl?

Accepted Answer

$i = 2$

Question 4

Which of the following compounds will have the largest Van’t Hoff factor ($i$) when dissolved in water?

Accepted Answer

$\mathrm{K_2SO_4}$

Question 5

A 1.0 M solution of $\mathrm{K_3PO_4}$ is prepared. What is the osmolarity of the solution?

Accepted Answer

$4.0$

Question 6

Which of the following solutions will have the highest boiling point?

Accepted Answer

$1.0$ M $\mathrm{NaCl}$

Question 7

Which of the following compounds will have the highest vapor pressure when dissolved in water?

Accepted Answer

$0.5$ M glucose

Question 8

If 1 mol of $\mathrm{CaCl_2}$ is dissolved in water, how many moles of ions are produced?

Accepted Answer

$3$

Question 9

Which equation correctly represents the calculation of osmolarity for a solution?

Accepted Answer

$	ext{Osmolarity} = 	ext{Molarity} 	imes 	ext{Van’t Hoff factor}$

Question 10

A solution of $\mathrm{MgCl_2}$ is prepared at 0.5 M. What is the osmolarity of the solution?

Accepted Answer

$1.5$

Question 11

Which of the following will NOT affect the colligative properties of a solution?

Accepted Answer

The identity of the solute

Question 12

A student adds 1 mol of $\mathrm{Na_2SO_4}$ to water. What is the Van’t Hoff factor ($i$) for $\mathrm{Na_2SO_4}$?

Accepted Answer

$i = 3$

Question 13

Which of the following best explains why adding a solute to a solvent lowers its freezing point?

Accepted Answer

Solute particles disrupt the formation of the solid lattice, requiring a lower temperature to freeze.

Question 14

A solution contains 0.5 M $\mathrm{K_2SO_4}$. What is the total concentration of ions in the solution?

Accepted Answer

$1.5$ M

Question 15

Which of the following will have the lowest vapor pressure?

Accepted Answer

$1.0$ M $\mathrm{NaCl}$

Question 16

If 1 mol of $\mathrm{K_2SO_4}$ is dissolved in water, how many moles of ions are produced?

Accepted Answer

$3$

Question 17

Which of the following is a real-life application of colligative properties?

Accepted Answer

Using salt to melt ice on roads during winter

Question 18

A solution is made by dissolving 1 mol of $\mathrm{Ca(NO_3)_2}$ in water. What is the Van’t Hoff factor ($i$) for $\mathrm{Ca(NO_3)_2}$?

Accepted Answer

$i = 3$

Question 19

Which of the following solutions will have the highest osmotic pressure?

Accepted Answer

$1.0$ M $\mathrm{K_2SO_4}$

Question 20

A solution is prepared by dissolving 1 mol of glucose ($\mathrm{C_6H_{12}O_6}$) in water. What is the Van’t Hoff factor ($i$) for glucose?

Accepted Answer

$i = 1$

Colligative Properties, Van't Hoff Factor, and Osmolarity in Chemistry

Study Guide - Practice Questions