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Solubility Product

Solubility of...

Question

Solubility of $C a {(O H)}_{2}$ is $s$ $m o l L^{- 1}$ . The solubility product $(K_{s p)}$ under the same condition is:

4 s^{3}

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3 s^{4}

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4 s^{2}

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s^{3}

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Solution

The correct option is A $4 s^{3}$
$C a {(O H)}_{2} ⇌ {C a}^{2 +} + 2 {O H}^{-}$
$K_{s p} = [{C a}^{2 +}] {[{O H}^{-}]}^{2}$
$= (s) {(2 s)}^{2} = 4 s^{3}$

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