First slide

Solubility product(KSP)

Question

If the solubility product of MOH is 1×10^–10 mol².dm^–2, then the pH of saturated aqueous MOH solution will be

Moderate

A

12
B

9
C

6
D

3

Solution

$\large MOH\left( s \right) \rightleftharpoons \mathop {MOH}\limits_S \left( {aq} \right)\xrightarrow{{}}\mathop {{M^ + }}\limits_S \left( {aq} \right) + \mathop {O{H^ - }}\limits_S \left( {aq} \right)$
$\large {K_{sp}} = {S^2} \Rightarrow {10^{ - 10}} = {S^2} \Rightarrow S = {10^{ - 5}}$
$\large OR\left[ {O{H^ - }} \right] = {10^{ - 5}} \Rightarrow {P^{OH}} = 5 \Rightarrow {P^H} = 9$

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