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Q.

What is the $pH$ of a saturated solution of milk of magnesia, $M g {(O H)}_{2}$ if the $K_{s p}$ of this compound is $4 \times 10^{- 12} ?$

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a

$10.9$

b

$3.5$

c

$10.3$

d

$9.2$

answer is C.

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Detailed Solution

$4 s^{3} = 4 \times 10^{- 12}$

$2 s = [{OH}^{-}]$

$= 2 \times 10^{- 4}$

$pH = 10.3$

Hence, option C is correct.

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