InterviewSolution
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InterviewSolution
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What is the maximum molarity of `Co^(+2)` ions in `0.1M HC1` saturated with `0.1M H_(2)S. (K_(a) = 4 xx 10^(-21))`. Given: `K_(sp)` of `CoS = 2xx10^(-21)`.A. `0.10M`B. `1.00M`C. `4.48 xx 10^(-11)M`D. `0.50M` |
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Answer» Correct Answer - D `H_(2)S hArr 2H^(o+) +S^(2-) (K_(a) = ([H^(o+)]^(2)[S^(2-)])/([H_(2)S]))` `[S^(2-)] = (K_(a)[H_(2)S])/([H^(o+)]^(2)) = (4 xx 10^(-21)xx0.1)/((0.1)^(2)) = 4 xx 10^(-20)M` For precipitation, `Q_(sp) = K_(sp)` `[Co^(2+)] = (K_(sp)of CoS)/([S^(2-)]) = (2xx 10^(-21))/(4xx10^(-20)) = 0.05M` |
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