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QJEEM02Ch05c3: JEE Main 2002 Chemistry - Class 11 JEEM02Ch05c3 Solution: Let the solubility of an aqueous solution of Mg(OH) 2 be x then …

Let the solubility of an aqueous solution of Mg(OH)₂ be x then its K_sp is :

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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}.