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What is the minimum pH required to prevent the precipitation of ZnS in a solution that is `0.01 M ZnCl_2` and saturated with `0.10 M H_2S`? Given `K_(sp)` of `ZnS=10^(-21)` , for `H_2S K_(a_1)xK_(a_2)=10^(-20)` |
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Answer» Correct Answer - 1 `K_(sp)=[Zn^(2+)][S^(-2)]` :. [5^2]=10^(-21)/10.01=10^(-19)` `K_(a_1)xxK_(a_2)=([H^+]^(2)[10^(-19)])/0.1implies 10^(-20)=([H^+]^(2)[10^(-19)])/0.1` `[H^+]=10^(-1)` pH=1 |
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