Chapter 17, Problem 135CP

Interpretation Introduction

Interpretation: The fraction of moles of $\text{NaCl}$ that exists as ion pairs in the given solution should be determined.

Concept Introduction: The ratio of number of moles of a substance in a compound to the total number of moles of the compound is said to be mole fraction. The formula is:

  $\text{Mole fraction = }\frac{\text{Number of moles of a substance}}{\text{Total number of moles in compound}}$

Interpretation Introduction

Interpretation: The freezing point for the given solution needs to be calculated.

Concept Introduction: The formula used to determine freezing point of solution is:

  $\Delta {\text{T}}_{\text{f}}{\text{ = K}}_{\text{f}}m$

Where $\Delta {\text{T}}_{\text{f}}$ is change in freezing point, ${\text{K}}_{\text{f}}$ is molal freezing point constant and $m$ is molality.