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Question

What is the minimum pH required to prevent the precipitation of ZnS in a solution that is 0.01 M ZnCl2 and saturated with 0.10M H2S?
[Given : Ksp=1021,Ka1×Ka2=1020]

A
\N
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B
1
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C
2
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D
4
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Solution

The correct option is B 1
Ksp=[Zn2+][S2]
[S2]=10210.01=1019
for Ka2×Ka2=[H+]2[S2][H2S]
1020=[H+]2×10190.1[H+]=0.1
Or pH=1

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