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Solubility

Which express...

Question

Which expression correctly represents solubility product for,

$B a {(O H)}_{2} \cdot 8 H_{2} O (s) ⇌ {B a}^{2 +} (a q) + 2 {O H}^{-} (a q) + 8 H_{2} O (l)$ :

K_{s p} = [{B a}^{2 +}] {[{O H}^{-}]}^{2}

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K_{s p} = [{B a}^{2 +}] {[{O H}^{-}]}^{2} {[H_{2} O]}^{8}

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K_{s p} = [{B a}^{2 +}] {[{2 O H}^{-}]}^{2}

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K_{s p} = [{B a}^{2 +}] {[{2 O H}^{-}]}^{2} {[{8 H}_{2} O]}^{8}

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Solution

The correct option is A $K_{s p} = [{B a}^{2 +}] {[{O H}^{-}]}^{2}$
Hydration does not influence $K_{s p}$ .

So, $B a {(O H)}_{2} \cdot 8 H_{2} O (s) ⇌ {B a}^{2 +} (a q) + 2 {O H}^{-} (a q) + 8 H_{2} O (l)$

$K_{s p} = [{B a}^{2 +}] {[{O H}^{-}]}^{2}$

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