Solubility

The solubility of Mg(OH)₂ (Ksp = 10^-12) in solution of pH value 12 is

1. 10^-8

2. 10^-6

3. 10^-5

4. 10^-10

5 Answers

Mg(OH)₂â‰ˆMg²⁺+2OH^-

And at pH=12,,there will be predominantly OH^- ions...use this and get the answer

106

Asish Mahapatra ·2009-11-02 05:18:46

at pH = 12 conc. of OH- = 10^-2

Mg(OH)2 == Mg2+ + 2OH-
1-s s 2s+10^-2

Ksp = [Mg2+][OH-]² = s*(2s+10^-2)²

As s<<10^-2

So, s*10^-4 = 10^-12

=> s = 10^-8

small correction Asish

s*10^-4 = 10^-12

So, s = 10^-8

Anyways thanks for the solution both of u

106

Asish Mahapatra ·2009-11-02 21:10:42

oh yeah forgot to square it

edited :)

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