Chemistry - Ionic Equilibrium Question with Solution | TestHub

${\text{CH}}_2{\text{ClCOO}}^{-}+{\text{H}}_2\text{O}\rightleftharpoons {\text{CH}}_2\text{ClCOOH}+{\text{OH}}^{-}$
$\left[{\text{OH}}^{-}\right]\text{=}\text{ch}\text{=}\text{C}\cdot \sqrt{\frac{{\text{K}}_{\text{H}}}{\text{c}}}\text{=}\sqrt{{\text{K}}_{\text{H}}\text{·c}}\text{=}\sqrt{\frac{{\text{K}}_{\text{w}}\text{×}\text{c}}{{\text{K}}_{\text{a}}}}$
$=\sqrt{{\text{K}}_{\text{b}}\times \text{c}}=\sqrt{\text{6.4}\times 10^{-12}\times \text{0.1}}$
$=\text{8}\times 10^{-7}$
$\therefore pOH =\text{6.1}$
$\text{pH} = \text{7.9}$