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0.001 mole each of Fe^(2+) and Cd^(2+) is present in one litre of 0.02M HCl, saturated with H_2S . Find whether each of these ions shall precipitate as sulphides. Calculate [Cd^(2+)] in the solution at equilibrium. K_a(H_2S) = 1 xx 10^(-21), K_(sp) (Cds) = 8 xx 10^(-27) , K_(sp) (FeS) = 3.7 xx 10^(-19)

Answer»

Solution :CDS precipitates , `[Cd^(2+) ] = 3.86 X 10^(-8) M`


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