Question

What is the coordination entity formed when excess of kcn is added?

Answer 1

Answer:

Aqueous solution of copper sulphate contains Cu2+ ions in 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 following reaction: CuSO4 (aq) + 4KCN → K2[Cu(CN)4] + K2­SO4(aq) Cu(H2O)42+ + 4CN(from aq. KCN) → Cu(CN)42-(highly stable coordination entity) + 4H2OCyanide ligand CN

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