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At 25^@C, will a precipitate of Mg(OH)2 ...

At `25^@C`, will a precipitate of `Mg(OH)_2` form in a `10^(-4)M` solution of `Mg(NO_3)_2` if pH of the solution is adjusted to 9.0. `K_(sp) [Mg(OH)_2]= 10^(-11) M^3`. At what min value of pH will precipitation start.

A

10.5

B

18

C

27

D

6

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The correct Answer is:
A
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K_(sp) of Mg(OH)_(2) is 4.0 xx 10^(-6) . At what minimum pH, Mg^(2+) ions starts precipitating 0.01MgCI

A solution containing 10^(-2) M MgCl_(2) will just form precipitate when pH in the solution is : K_(sp)(Mg(OH)_(2))=10^(-12)

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