Question

A 1.241 Maqueous solution of${\mathbf{AgNO}}_{\mathbf{3}}$(used to prepare silver chloride photographic emulsions) has a density of$\mathbf{1}\mathbf{.}\mathbf{171}\mathbf{}\mathbf{g}\mathbf{}{\mathbf{cm}}^{\mathbf{-}\mathbf{3}}$. Compute its molality.

Short answer

The molality of the given silver chloride solution is 1.28 mol/kg.

Step-by-step solution

Define molality and density of solution

Calculate the mass of silver chloride in the solution

Calculate the mass of solution

Mass of solution per 1L is calculated by the use of the density formula as follows:

$\begin{array}{l}m(solution)=\rho \times V\\ m(solution)=1.171\times 1\\ m(solution)=1.171\mathrm{kg}\end{array}$

Calculate the mass of solvent 

Determine the molality of the solution