Chapter 17, Problem 78E

(a)

Interpretation Introduction

Interpretation:

The freezing point and the boiling point of 5.0 g NaCl in 25 g H₂Oshould be calculated.

Concept Introduction :

Changes in freezing and boiling points can be obtained by the following modified equation.

  $\Delta T=imK$

  $\begin{array}{l}\Delta T\text{ - Boiling point elevation or Freezing point depression}\\ \text{i - van't Hoff factor}\\ \text{m - molality}\\ \text{K - freezing point depression constant or boiling point elevation constant}\end{array}$

  $i=\frac{\text{moles of particles in solution}}{\text{moles of solute dissolved}}$

(b)

Interpretation Introduction

Interpretation:

The freezing point and the boiling point of 2.0 g Al(NO₃)₃ in 15 g H₂Oshould be calculated.

Concept Introduction :

Changes in freezing and boiling points can be obtained by the following modified equation.

  $\Delta T=imK$

  $\begin{array}{l}\Delta T\text{ - Boiling point elevation or Freezing point depression}\\ \text{i - van't Hoff factor}\\ \text{m - molality}\\ \text{K - freezing point depression constant or boiling point elevation constant}\end{array}$

  $i=\frac{\text{moles of particles in solution}}{\text{moles of solute dissolved}}$