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Solids in Liquids

Solubility of...

Question

Solubility of salt $M_{2} X_{3}$ is y mol $d m^{- 3}$ . The solubility product of the salt will be:

6 y^{4}

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64 y^{4}

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36 y^{5}

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108 y^{5}

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Solution

The correct option is B $108 y^{5}$
The solubility of $M_{2} X_{3}$ is y
The expression for the solubility product is $K_{s p} = [2 M^{3 +}]^{2} [3 X^{2 -}]^{3}$
Substitute values in the above expression.
$K_{s p} = (2 y)^{2} (3 y)^{3} = 108 y^{5}$ .

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