Equilibrium Question 848

Question: The 0.001M solution of Mg(NO3)2 is adjusted to pH 9, Ksp of Mg(OH)2 is 8.9×1012 . At this pH

Options:

A) Mg(OH)2 will be precipitated

B) Mg(OH)2 is not precipitated

C) Mg(OH)3 will be precipitated

D) Mg(OH)3 is not precipitated

Show Answer

Answer:

Correct Answer: B

Solution:

pH=9;[H+]=109;[OH]=105;

[Mg2+]=1×103;[Mg2+][OH]2=1×1013 given Ksp of Mg(OH)2=8.9×1012 which is more than 1×1013 . Hence Mg(OH)2 will not precipitate



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