Chapter 17, Problem 114RQ

The molar solubility of $\text{Zn}{\left(\text{OH}\right)}_{\text{2}}\text{in 1}\text{.0 }M{\text{ NH}}_{\text{3}}$ is $\text{5}{\text{.7 × 10}}^{\text{-3}}{\text{mol L}}^{\text{-1}}$. Determine the value of the instability constant of the complex ion, $\text{Zn}{\left({\text{NH}}_{\text{3}}\right)}_{\text{4}}{}^{\text{2+}}$. Ignore the reaction, ${\text{NH}}_{\text{3}}{\text{+ H}}_{\text{2}}\text{O}\stackrel{}{\rightleftharpoons }{\text{NH}}_{\text{4}}{}^{\text{+}}{\text{+ OH}}^{\text{-}}$.