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6-2.Equilibrium-II (Ionic Equilibrium)
hard
$0.10 \mathrm{M} \mathrm{Mg}^{2+}$ આયનો ધરાવતા દ્રાવણમાંથી કઈ $pH$ પર $\mathrm{Mg}(\mathrm{OH})_2\left[\mathrm{~K}_{\mathrm{sp}}=1 \times 10^{-11}\right]$ ના અવક્ષેપન ની શરૂઆત થાય છે તે____________.
A
$08$
B
$09$
C
$10$
D
$11$
(JEE MAIN-2024)
Solution
Precipitation when $Q_{s p}=K_{s p}$
${\left[\mathrm{Mg}^{2+}\right][\mathrm{OH}]^2=10^{-11}}$
$0.1 \times\left[\mathrm{OH}^{-}\right]^2=10^{-11} \Rightarrow\left[\mathrm{OH}^{-}\right]=10^{-5}$
$\Rightarrow \mathrm{pOH}=5 \quad \Rightarrow \mathrm{pH}=9$
Standard 11
Chemistry
