$[$આપેલ : પાણીમાં $Ca ( OH )_{2}$ નો દ્રાવ્યતા ગુણાકાર $=5.5 \times 10^{-6}$ છે.$]$
$\quad \quad \quad \quad \quad \quad \quad \quad s\quad \quad \quad \quad \quad 2s$
$k _{ sp }= s (2 s )^{2} \Rightarrow 5.5 \times 10^{-6}=4 s ^{3}$
$\Rightarrow s =\left(\frac{5.5}{4}\right)^{\frac{1}{3}} \times 10^{-2}=1.11 \times 10^{-2}$
[આપેલ : $\sqrt{2}=1.41$ ]