Question

Explain why the solubility of an ionic compound increases as

the ionic strength of the solution increases (at least up to ,0.5 M ).

Short answer

The solubility of an ionic molecule increases as the attraction between ions decreases.

Step-by-step solution

Define the formula for ionic strength

The ionic strength of a solution is the amount of ion concentration in it. It's written in the form of I. It has an impact on ion activity. The ion interaction with water and other ions in the solution is marked.

The ionic strength formula is used to calculate half of each ionic species' total concentration.

The formula for ionic strength is as follows:

$l=\frac{1}{2}\underset{1}{\sum ^n}{c}_i{c}_i^2$

where

${\mathrm{c}}_{\mathrm{i}}-\mathrm{concentration}\mathrm{of}\mathrm{the}{\mathrm{i}}^{\mathrm{th}}\mathrm{species}\mathrm{and}{\mathrm{z}}_{\mathrm{i}}-\mathrm{is}\mathrm{its}\mathrm{change}.$

Step 2: Explain the answer

The charges of (z) of the ionic atmospheres will grow as the ionic strength $\mu$of the provided solution increases. As a result, the ions' net attraction (positive and negative ions) decreases.

Thus the solubility of an ionic molecule increases as the attraction between ions decreases.