JEE MAIN - Chemistry (2002 - No. 6)
Let the solubility of an aqueous solution of Mg(OH)2 be x then its Ksp is :
4x3
108x5
27x4
9x
Explanation
$$Mg{\left( {OH} \right)_2} \to \mathop {\left[ {M{g^{2 + }}} \right]}\limits_x + 2\mathop {\left[ {O{H^ - }} \right]}\limits_{2x} $$
$${K_{sp}} = \left[ {Mg} \right]{\left[ {OH} \right]^2}$$
$$ = \left[ x \right]{\left[ {2x} \right]^2}$$
$$ = x.4{x^2} = 4{x^3}.$$
$${K_{sp}} = \left[ {Mg} \right]{\left[ {OH} \right]^2}$$
$$ = \left[ x \right]{\left[ {2x} \right]^2}$$
$$ = x.4{x^2} = 4{x^3}.$$
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