Q.

The solubility of Ca(OH)2 in water is 6 ×10–6M. The solubility of Ca(OH)2 in a buffer solution of pH = 10 is

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a

3.5 × 10–10M

b

8.64 × 10–8M

c

2.26 × 10–6M

d

1.8 × 10–2M

answer is B.

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Detailed Solution

Let the solubility of Ca(OH)2 in a buffer of PH = 10 be SCa(OH)2(s)⇌Ca(OH)2s(aq)→Ca+s(aq)+2OH-(a2S+10-4q)Ksp=S'2S'+10-42=4×S3⇒S'×10-8=4×6×6×6×10-18⇒S'=8.64×10-18
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