Chapter 12, Problem 12.65QE

Interpretation Introduction

Interpretation:

The freezing and boiling points of the solution in degree Celsius has to be calculated.

Concept Introduction:

Boiling-point elevation:  The effect of the solute concentration on the boiling point is given by the equation,

  ${\text{ΔT}}_{\text{b}}{\text{=mk}}_{\text{b}}$

Here,

  ${\text{ΔT}}_{\text{b}}\text{=}$ Increase in the boiling point (difference in boiling point of solution and boiling point of the solvent).

  $\text{m=}$ Molal concentration of the solute

  ${\text{k}}_{\text{b}}\text{=}$ Boiling point elevation constant (depends on the solvent used).

Freezing point depression:  The freezing point depression is proportional to the concentration of the solute particles and is given by the equation,

  ${\text{ΔT}}_{\text{f}}{\text{=mk}}_{\text{f}}$

Here,

  ${\text{ΔT}}_{\text{f}}\text{=}$ Freezing point of the solution

  $\text{m=}$ Molal concentration of the solute

  ${\text{k}}_{\text{f}}\text{=}$ Freezing point depression constant (depends on the solvent used).