What is the minimum pH required to prevent the precipitation of ZnS in a solution that is 0.01MZnCl2 and saturatedwith 0.1M H2S ?Given: Ksp of ZnS=10-21,Ka1×Ka2=10-20

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answer is 2.

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Detailed Solution

Ksp=Zn+2S-2=10-21, S-2=10-210.01=10-19, For H2S, Ka1×Ka2=H+2S-2H2S=10-20 H+2=0.1×10-2010-19=0.01, Hence,H+=0.1 Therefore,pH=1

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