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Question
Aqueous copper sulphate solution (blue in colour) gives a bright green solution with aqueous potassium chloride. Explain this experimental result.
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Solution
Aqueous copper sulphate solution exists as [Cu(H2O)4]SO4 and is blue in colour due to the presence of [Cu(H2O)4]2+ ions.
When KCl solution is added, the Cl– ligands replace the weak H2O ligands and form [CuCl4]2− ions, which are bright green in colour.
\[\ce{[Cu(H2O)4]^2+ + \underset{[From KCl_{( aq)}]}{4Cl-}->\underset{(bright green colour)}{\underset{tetrachloridocuprate (II) ion}{[CuCl4]^2-}} + 4H2O}\]
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