Ionic EquilibriumHard
Question
Slaked lime, Ca(OH)2 is used extensively in sewage treatment. What is the maximum pH that can be established in Ca(OH)2 (aq):
Ca(OH)2 (s) ⇋ Ca2+ (aq) + 2OH- (aq) ; KSP = 5.5 × 10-6
Ca(OH)2 (s) ⇋ Ca2+ (aq) + 2OH- (aq) ; KSP = 5.5 × 10-6
Options
A.1.66
B.12.35
C.7.0
D.14.0
Solution
KSP of Ca(OH)2 = 4s3 = 5.5 × 10-6
∴ s = 3
= 1.11 × 10-2
∴ [OH-] = 2s = 2 × 1.11 × 10-2
∴ pOH = 1.65 ∴ pH = 12.35
∴ s = 3
= 1.11 × 10-2 ∴ [OH-] = 2s = 2 × 1.11 × 10-2
∴ pOH = 1.65 ∴ pH = 12.35
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