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Question

The pH at which Mg(OH)2 begins to precipitate from a solution containing 0.10M Mg2+ ions. KspMg(OH)2=1011 is _______.

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Solution

For the just precipitation of Mg(OH)2 from a solution having [Mg2+]=0.10M

Ksp=[Mg+][OH]2

1×1011=[0.1][OH]2

[OH]=105M

or pOH=5

pH=14pOH=145=9

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