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Q.

Slaked lime, Ca(OH)2 is used extensively in sewage treatment. \rvhat 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

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a

1.66

b

12.35

c

7

d

14

answer is B.

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Detailed Solution

Ksp=5.5×10−6 Ca(OH)2⇌Ca2++2OH− Ca2+OH−2=5.5×10−6 4S3=5.5×10−6; S=0.0111 ∴ OH−=2S=0.0111×2=0.0222 ∴ pOH=1.65 pH=12.35
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