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0.001 mole each of Fe^(2+) and Cd^(2+) i...

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)`

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Cds precipitates , `[Cd^(2+) ] = 3.86 x 10^(-8) M`
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