Chapter 11, Problem 11.100AP

Interpretation Introduction

Interpretation: The melting point of a mixture of $2.00\text{lb}$ of $\text{NaCl}$ and $12.00\text{lb}$ of ice is to be calculated if exactly half of the ice melts. The $\text{NaCl}$ dissolves in the melted ice is to be assumed.

Concept introduction: When a salt like $\text{NaCl}$ is mixed with ice, it behaves as an impurity. As a result melting point of mixture decreases. Molality is defined as the number of moles of solute present per kilogram of solvent.

To determine: The melting point of a mixture of $2.00\text{lb}$ of $\text{NaCl}$ and $12.00\text{lb}$ of ice, if exactly half of the ice melts.