Chapter 14, Problem 70E

Interpretation Introduction

Interpretation:

The expected normal boiling point of the solution should be determined.

Concept introduction:

Freezing point depression and boiling point elevation are colligative properties. Colligative properties are properties of a solution that rely on number of solute particles and not on the identity of solute.

Van’t Hoff introduced a term i, which is the ratio of the measured value of a colligative property to the expected value if the solute is an electrolyte.

$i=\frac{\text{measured }\Delta {\text{T}}_f}{\text{expected }\Delta {\text{T}}_f}$

$\begin{array}{l}\Delta T_f=-i\times K_f\times m\\ \Delta T_b=i\times K_b\times m\end{array}$