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

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

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