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When aqueous KCN is added to a solution of CuSO_(4), a whitie precipitate solube in RCN is formed. But no precipate to formed when H_(2)S gas is bubbled through this solution. Explain. |
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Answer» Solution :The white PRECIPATE FORMED dissolves in EXCESS of KCN to form a soluble complex. LTRBGT `CuSO_(4) + 2KCN to underset("white ppt")Cu(CN)_(2) + K_(2)SO_(4)` `Cu(CN)_(2) + 2KCN to underset("Soluble complex")(K_(2)[Cu(CN)_(4)])` This complex is quite stable and `H_(2)S` gas is not in a position to break this. That is why, no precipitate is formed. |
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