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A solution is 0.10 M Co^(2+) and 0.10 ...

A solution is 0.10 M `Co^(2+)` and 0.10 M `Hg^(2+)` . Calculate the range of pH in which only one of the metal sulphides precipitates when the solution is saturated in `H_2S. K_(sp) (CoS) = 4 xx 10^(-21)` and `K_(sp) (HgS) = 1.6 xx 10^(-52)`

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pH less than 0.8
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