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6-2.Equilibrium-II (Ionic Equilibrium)
medium
$K_{SP}$ of $Mg(OH)_2$ is $1 \times 10^{-12}$. $0.01\,M \,MgCl_2$ will show precipitation in a solution of $pH$ reater than:-
A
$3$
B
$9$
C
$6$
D
$8$
Solution
$\mathrm{K}_{\mathrm{sp}}=\left[\mathrm{Mg}^{2+}\right][\mathrm{OH}]^{2}$
$1 \times 10^{-12}=0.01[\mathrm{OH}]^{2}$
$1 \times 10^{-10}=\left[\mathrm{OH}^{-}\right]^{2}$
$1 \times 10^{-5}=[\mathrm{OH}]$
$5=\mathrm{pH}$
$14-5=pH$
$9=pH$
Standard 11
Chemistry
