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Solubility Product

The solubilit...

Question

The solubility of $A l {(O H)}_{3}$ is $^{'} S^{'} g m o l L^{- 1}$ . Its solubility product is:

S^{2}

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S^{3}

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27 S^{4}

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27 S^{3}

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Solution

The correct option is C $27 S^{4}$
$A l {(O H)}_{3} ⇌ {A l}^{3 +} + 3 {O H}^{-}$
$100 . . . . i n i t i a l l y$
$1 - S S 3 S$
$K_{s} = [{A l}^{3 +}] {[{O H}^{-}]}^{3} = S \times {(3 S)}^{3} = 27 S^{4}$

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