# Quiz | Colligative Properties of Solutions

1

Which factor does not affect the solubility of a solid in a solvent?

Nature of the solvent

Nature of the solute

Pressure

Temperature

A solid is more soluble at higher temperatures and in a solvent with similar types of intermolecular forces

2

Which of the following is incorrect?

Gas are more soluble at higher pressure

Gas are more soluble as temperature increases

Solubility of a gas is proportional to the pressure of the gas

Henry’s law constant depends upon the gas, the solvent and the temperature

3

How is the vapor pressure of a solution compared to the vapor pressure of the pure solvent?

Lower

Equal

Greater

It depends on the temperature

Vapor pressure of the solution < Vapor pressure of the pure solvent

4

Which of the following colligative properties arises in systems where there is an equilibrium between 2 liquid solution phases?

Osmotic pressure

Boiling point elevation

Freezing point depression

Lowering of vapor pressure

Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane

5

What is the van’t Hoff i-factor for Ba(OH)2 (s) dissolved in water?

0

1

2

3

van’t Hoff i-factor = number of ions produced per formula unit
Ba(OH)2 (s) $\to$ Ba2+ (aq) + 2 HO- (aq)   ⇒   3 ions are produced when Ba(OH)2 is dissolved in water

6

What is a semipermeable membrane in the context of osmosis?

A membrane that allows both solute and solvent particles to pass through it

A membrane that allows solvent, but not solute particles, to pass through it

A membrane that allows neither solute nor solvent particles to pass through it

A membrane that allows solute particles, but not solvent particles, to pass through it

Osmosis: movement of solvent particle through a semipermeable membrane while the solute particles stay within their respective solutions