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(D) In an acidic medium,the ionization of $H_2S$ is suppressed due to the common ion effect of $H^+$ ions,resulting in a very low concentration of $S^

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$Cu^{2+}$

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(D) In an acidic medium,the ionization of $H_2S$ is suppressed due to the common ion effect of $H^+$ ions,resulting in a very low concentration of $S^{2-}$ ions.Only the metal sulfide with the lowest solubility product $(K_{sp})$,which is $CuS$,will exceed its solubility product and precipitate.$Cu^{2+}$ belongs to Group $II$ of the qualitative analysis scheme,while $Zn^{2+}$ and $Ni^{2+}$ belong to later groups that require higher $S^{2-}$ concentrations for precipitation.Therefore,only $Cu^{2+}$ precipitates.

When $H_2S$ is passed through a mixture containing $Cu^{2+}$,$Ni^{2+}$,and $Zn^{2+}$ in an acidic solution,which ion will precipitate?

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