Passing H_2S gas into a mixture of Mn^{2+}, N | vedclass

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(A) In an acidified aqueous solution,the concentration of $S^{2-}$ ions is very low due to the common ion effect of $H^+$.Only the sulphides of group

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$CuS$ and $HgS$

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(A) In an acidified aqueous solution,the concentration of $S^{2-}$ ions is very low due to the common ion effect of $H^+$.Only the sulphides of group $II$ cations $(Cu^{2+}, Hg^{2+})$ have a solubility product $(K_{sp})$ low enough to be exceeded by the ionic product at this low $S^{2-}$ concentration.Therefore,$CuS$ and $HgS$ precipitate,while $Mn^{2+}$ and $Ni^{2+}$ remain in the solution.

Passing $H_2S$ gas into a mixture of $Mn^{2+}, Ni^{2+}, Cu^{2+}$ and $Hg^{2+}$ ions in an acidified aqueous solution precipitates

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Passing $H_2S$ gas into a mixture of $Mn^{2+}$,$Ni^{2+}$,$Cu^{2+}$ and $Hg^{2+}$ ions in an acidified aqueous solution precipitates

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