Chapter SM, Problem 24PQ

Interpretation Introduction

Interpretation:

The lowering of freezing point by addition of $800\text{ g}$ of ethanol to $8\times {10}^3\text{ g}$ of water has to be determined.

Concept Introduction:

Colligative properties are properties that depend on number of particles of solute. The four colligative properties are as follows:

1. Relative lowering of vapor pressure

2. Elevation in boiling point

3. Depression in freezing point

4. Osmotic pressure

The expression for freezing point depression is as follows:

  $\Delta {\text{T}}_{\text{f}}=K_{\text{f}}m$        (1)

Here,

  $\Delta {\text{T}}_{\text{f}}$ is depression in freezing point.

  $K_{\text{f}}$ ismolal freezing point depression constant.

  $m$ is molality of solution.