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Basic Buffer Action

Calculate pH ...

Question

Calculate pH at which $M g (O H)_{2}$ begin to precipitate form a solution containing 0.1 M $M g^{2 +}$ ions.
$K_{s p}$ of $M g (O H)_{2} = 1 \times 10^{- 11}$

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Solution

When $M g (O H)_{2}$ starts precipitation, then

$[M g^{2 +}] [O H^{⊝}]^{2} = K_{s p}$ of $M g (O H)_{2}$

$[0.1] [O H^{⊝}]^{2} = 1 \times 10^{- 11}$

$∴ [O H^{⊝}] = 10^{- 5} M ∴ p O H = 5$

$∴ p H = 14 - p O H$

$p H = 14 - 5 = 9$

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