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InterviewSolution
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The values of `K_(sp)` of two sparingly solubles salts, `Ni(OH)_(2)` and `AgCN` are `2.0 xx 10^(-15)` and `6 xx 10^(-7)` respectively, which salt is more soluble? Explain |
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Answer» `AgCN hArr Ag^(+) + CN^(-)` `K_(sp) = [Ag^(+)][CN^(-)] = 6 xx 10^(-17)` `Ni(OH)_(2) hArr Ni^(2+) + 2OH^(-)` `K_(sp) = [Ni^(2+)][OH^(-)]^(2)=2xx10^(-15)` Let `[Ag^(+)] = S_(1),` then `[CN] = S_(1)` Let `[Ni^(2+)] = S_(2)`, then `[OH^(-)] = 2S_(2)` `S_(1^(2)) = 6 xx 10^(-17), S_(1) = 7.8 xx 10^(-9)` `(S_(2))(2S_(2))^(2) = 2 xx 10^(-15), S_(2) = 0.58 xx 10^(-4)` `Ni(OH)_(2)` is more soluble than `AgCN`. |
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