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6-2.Equilibrium-II (Ionic Equilibrium)
medium
The solubility of $Ca ( OH )_{2}$ in water is ....... .
[Given : The solubility product of $Ca ( OH )_{2}$ in water $\left.=5.5 \times 10^{-6}\right]$
A
$1.77 \times 10^{-6}$
B
$1.11 \times 10^{-6}$
C
$1.11 \times 10^{-2}$
D
$1.77 \times 10^{-2}$
(JEE MAIN-2021)
Solution
$Ca ( OH )_{2} \rightleftharpoons Ca ^{2+}( aq )+2 OH ^{-}( aq )$
$\quad \quad \quad \quad \quad \quad \quad \quad s\quad \quad \quad \quad \quad 2s$
$k _{ sp }= s (2 s )^{2} \Rightarrow 5.5 \times 10^{-6}=4 s ^{3}$
$\Rightarrow s =\left(\frac{5.5}{4}\right)^{\frac{1}{3}} \times 10^{-2}=1.11 \times 10^{-2}$
Standard 11
Chemistry
