PH of a saturated solution of Cu(OH)₂ ? (K_{sp} = 4.0 × 10^{-6} )

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6-2.Equilibrium-II (Ionic Equilibrium)

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What is the $pH$ of a saturated solution of $Cu(OH)_2$ ? $(K_{sp} = 4.0 \times 10^{-6}$ )

A

$6.1$

B

$12.3$

C

$8.42$

D

$11.8$

Solution

$S=\left[\frac{k_{s p}}{4}\right]^{\frac{1}{3}}, \therefore\left\{\mathrm{OH}^{-}\right\}=2 \mathrm{S}=2 \times 10^{-2}$

$\therefore \mathrm{pOH}=-\log 2 \times 10^{-2}=1.7$

$\therefore \mathrm{pH}=14-1.7=12.3$

Standard 11

Chemistry

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