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Question
Aqueous copper sulphate solution (blue in colour) gives a green precipitate with aqueous potassium fluoride. Explain this experimental result.
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Solution
Aqueous CuSO4 solution contains [Cu(H2O)4]2+ ions, which impart a blue colour. When KF is added, H2O, being a weak field ligand, can be replaced by F−, forming [CuF4]2− ions, which impart a green colour.
\[\ce{\underset{Tetraaquacopper(II) ion}{[Cu(H2O)4]^2+} + \underset{[From KF_{( aq)}]}{4F-} -> \underset{(Green ppt{.})}{\underset{Tetrafluoridocuprate (II) ion}{[CuF4]^2-}} + 4H2O}\]
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