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Question

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g)is passed through this solution?

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Solution

When excess of KCN(aq) is mixed with CuSO4(aq), a complex named potassiumtetracyanocuprate (II) is formed. Since, CN ions are strong ligands, the complex is quite stable. It is evident from the stability constant value (K=2.0×1027).

4KCN(aq)(Excess)+CuSO4(aq) K2[Cu(CN)4](aq)(Soluble)+K2SO4(aq) +H2S No cleavage and no Production of Cu2+ions


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