Chemistry - Ionic Equilibrium Question with Solution | TestHub

$\begin{array}{ccccc}\text{NaOH}& \rightleftharpoons & {\text{Na}}^{+}& +& {\text{OH}}^{-}\\ & & \text{C M}& & \text{CM}\end{array}$

$\begin{array}{ccccc}\text{Ni}{\left(\text{OH}\right)}_2& \rightleftharpoons & {\text{Ni}}^{2+}& +& {2\text{OH}}^{-}\\ \text{x}& & \text{x}& & \text{2x}\end{array}$

$\therefore$${\text{K}}_{\text{s}\text{p}}=\left[\text{N}{\text{i}}^{2+}\right]{\left[\text{O}{\text{H}}^{-}\right]}^2$

$=\text{x}{\left(\text{x}+\text{C}\right)}^2$

${\text{K}}_{\text{s}\text{p}}=\text{x}{\text{C}}^2$(neglecting higher power of$\text{x}$)

$\text{x}=\frac{{\text{K}}_{\text{s}\text{p}}}{{\text{C}}^2}=\frac{1.9\times {10}^{-15}}{{\left(1\right)}^2}$