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Question
Aqueous copper sulphate solution (blue in colour) gives a green precipitate with aqueous potassium fluoride. Explain this experimental result.
Solution
Aqueous copper sulphate solution exists as [Cu(H2O)4]SO4 and is blue in colour due to [Cu(H2O)4]2+ ions.
When KF solution is added, the weak H2O ligands are replaced by strong F-ligands. Thus, [CuF4]2− ions are formed, which give green precipitate.
\[\ce{[Cu(H2O)4]^2+ + \underset{[From KF_{( aq)}]}{4F-} -> \underset{(Green ppt.)}{[CuF4]^2-} + 4H2O}\]
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