When aqueous solution of potassium fluoride is added to the blue coloured aqueous CuSO 4…
Chemistry · Class 12 · CBSE — Coordination Compounds
When aqueous solution of potassium fluoride is added to the blue coloured aqueous CuSO4 solution, a green precipitate is formed. This observation can be explained as follows.
- On adding KF, H2O being weak field ligand is replaced by F– ions forming [CuF4]2– which is green in colour.
- Potassium is coordinated to [Cu(H2O)4]2+ ion present in CuSO4 and gives green colour.
- On adding KF, Cu2+ are replaced by K+ forming a green complex.
- Blue colour of CuSO4 and yellow colour of KI form green colour on mixing.
Answer
(A) On adding KF, H 2 O being weak field ligand is replaced by F – ions forming [CuF 4 ] 2– which is green in colour.
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