What is the coordination entity formed when excess of aqueous KCN isad – InterviewSolution

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1.	What is the coordination entity formed when excess of aqueous KCN isadded to an aqueous solution of copper sulphate? Why is it that no precipitateof copper sulphide is obtained when `H_(2)S` (g) is passed through this solution?
Answer» On mixing the aqueous solutions of KCN and `CuSO_(4)` the complex formed is potassium tetracyanocuprate(II), since `CN^(-)` ions are strong ligands, the complex is quite stable. It is evident from the stability constant value `(K = 2.0 xx 10^(27))`. It is not cleaved by `H_(2)S` gas when passed through the aqueous solution and no precipitate of CuS is formed. `CuSO_(4)(aq) + 4KCN(aq) rarr K_(2)[Cu(CN)_(4)] + K_(2)SO_(4)(aq)` (soluble)

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