Chapter 6, Problem 6.18P

Interpretation Introduction

Interpretation:

The result obtained from the separation of cation ${\text{A}}^{\text{3+}}$ from cation ${\text{B}}^{\text{2+}}$ by precipitation with ${\text{X}}^{\text{-}}$ anion when found $0.2\%$ of contamination of ${\text{AX}}_{\text{3}\left(\text{s}\right)}$ with ${\text{B}}^{\text{2+}}$ has to be explained.

Concept introduction:

Solubility product ${\text{(K}}_{\text{sp}}\text{)}$: It is defined as the product formed from mathematical product of its concentration of dissolved ion raised up to the power of their stoichiometric coefficient.

$\begin{array}{l}{\text{M}}_{\text{y}}{\text{X}}_{\text{z(s)}}\stackrel{}{\rightleftharpoons }{\text{yM}}^{\text{z+}}{}_{\text{(aq)}}{\text{+zX}}^{\text{y-}}{}_{\text{(aq)}}\\ \\ K_{sp}={\left[{\text{M}}^{\text{z+}}\right]}^y{\left[{\text{X}}^{\text{y-}}\right]}^{\text{z}}\end{array}$