A mixture containing Cu^{2+} and Ni^{2+} can | vedclass

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(A) In an acidic medium,the concentration of $S^{2-}$ ions is very low due to the common ion effect of $H^+$ ions. $Cu^{2+}$ (Group $II$ cation) has a

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Passing $H_2S$ in acidic medium

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(A) In an acidic medium,the concentration of $S^{2-}$ ions is very low due to the common ion effect of $H^+$ ions. $Cu^{2+}$ (Group $II$ cation) has a very low solubility product $(K_{sp})$ for its sulfide,$CuS$,allowing it to precipitate in an acidic medium. $Ni^{2+}$ (Group $IV$ cation) has a much higher $K_{sp}$ for its sulfide,$NiS$,and therefore does not precipitate in an acidic medium. Thus,passing $H_2S$ in an acidic medium allows for the separation of $Cu^{2+}$ from $Ni^{2+}$.

$A$ mixture containing $Cu^{2+}$ and $Ni^{2+}$ can be separated for identification by

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