Q.
The solubility product of PbBr2 is 10.8x10-5. It is 70% dissociated in saturated solution. The solubility of salt is
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a
4.285×10−2
b
6.756×10−3
c
3.399×10−4
d
5.435×10−2
answer is A.
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Detailed Solution
PbBr2⇄Pb2+0.7S+2Br-2×0.7S Ksp=Pb2+Br−2=(0.7S)(2×0.7S)2 10.8×10−5=(0.7)3×4S3 ∴ S=4.285×10−2M
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