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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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Aqueous solution of copper sulphate contains Cu2+ ions in the form of complex entity, [Cu(H2O)4]2+ and H2O ligand is a weak ligand. When excess of KCN is added, a new coordination entity, [Cu(CN)4]2- is formed due to the following reaction :

Cyanide ligand, CN- is a strong field lignad and stability constant of [Cu(CN4)]2- is quite large and thus practically no Cu2+ ions are left in solution. On passing H2S gas, no CuS is formed due to non- availability of Cu2+ ions in solution.

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