Equilibrium Question 279

Question: The solubility product of Mg (OH)2 is 1.2×10−11 . The solubility of this compound in gram per 100,cm3 of solution is [Roorkee 2000]

Options:

A) 1.4×10−4

B) 8.16×10−4

C) 0.816

D) 1.4

Show Answer

Answer:

Correct Answer: B

Solution:

Mg(OH)2 ⇌ Mg2+(s),+2OH−(2s)2,

Ksp=4S3⇒S=Ksp43=1.2×10−1143

S=8.16×10−4

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