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Question

The pH at which Mg(OH)2 begins to precipitate from a solution containing 0.10M Mg+ ions. KspMg(OH)2=10−11 is:

A
7
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B
9
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C
8
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D
4
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Solution

The correct option is B 9
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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