Chapter 12.8, Problem 12.17E

Interpretation Introduction

Interpretation:

The boiling point of $0.050m$ aqueous Magnesium chloride solution has to be determined.

Concept Introduction:

Elevation in boiling point is a colligative property which refers to increase in boiling point of the solution due to the addition of non-volatile solute.  It is expressed as,

$\Delta T_b=K_b.c_m$

Where,

$\begin{array}{l}{\text{ΔT}}_{\text{b}}\text{= elevation in boiling point}\\ {\text{K}}_{\text{b}}\text{= boiling point elevation constant}\\ {\text{c}}_{\text{m}}\text{= molal concentration}\end{array}$

For ionic solutions, the above expression becomes

$\Delta T_b=i\times K_b.c_m$

Where,

$i\text{ = van't Hoff factor}$

van’t Hoff factor refers to the number of moles of ions furnished by per unit formula of the ionic substance when it is dissolved.

Molality or molal concentration is a parameter used to express concentration of a solution.  It is expressed as,

$\text{Molality = }\frac{number\text{ of }molesof\text{ solute}}{mass\text{ of solvent in kg}}$