Ionic EquilibriumHard
Question
At 25oC, the solubility product of Mg(OH)2 is 1.0 × 10-11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions ?
Options
A.9
B.10
C.11
D.8
Solution
Mg2+ + 2OH- ⇋ Mg(OH)2
Ksp = [Mg2+][OH-]2
[OH-]=
∴ pOH = 4 and pH = 10
Ksp = [Mg2+][OH-]2
[OH-]=
∴ pOH = 4 and pH = 10
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