Chapter 11, Problem 113QP

Interpretation Introduction

Interpretation:

The reason for the similar values of molarity and molality for dilute aqueous solutions is to be determined.

Concept Introduction:

Molarity $\left(M\right)$ is defined as the number of moles $\left(n\right)$ of solute present in the volume of solution $\left(V\right)$ in litres. Molarity describes the concentration in terms of the volume of the solution.

$M=\frac{n}{V}$

Molality $\left(m\right)$ is defined as the number of moles $\left(n\right)$ of solute present in the mass(kilogram) of solvent $\left(w\right)$ in kilograms unit. Molality describes the concentration in terms of the amount of solvent but not solution.

$m=\frac{n}{w}$