When H_2S gas is passed through a solution co | vedclass

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(C) In the presence of $HCl$,the dissociation of $H_2S$ is suppressed due to the common ion effect of $H^+$ ions: $H_2S \rightleftharpoons 2H^+ + S^{2

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The common ion effect of $H^+$ ions decreases the concentration of $S^{2-}$ ions.

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(C) In the presence of $HCl$,the dissociation of $H_2S$ is suppressed due to the common ion effect of $H^+$ ions: $H_2S \rightleftharpoons 2H^+ + S^{2-}$.This leads to a very low concentration of $S^{2-}$ ions.The solubility product $(K_{sp})$ of second group sulfides is very low,so they precipitate even at low $S^{2-}$ concentrations.However,the $K_{sp}$ of fourth group sulfides is relatively high,so they do not precipitate under these conditions.

When $H_2S$ gas is passed through a solution containing $HCl$ during qualitative analysis,cations of the second group are precipitated,but cations of the fourth group are not precipitated because:

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