SELECT * FROM question_mgmt as q WHERE id=1939 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=64 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Aqueous copper sulphate solution (blue in colour) gives:

(i) a green precipitate with aqueous potassium fluoride, and

(ii) a bright green solution with aqueous potassium chloride

Explain these experimental results.

Answer:

Aqueous CuSO4 exists as [Cu(H2O)4]SO4. It is blue in colour due to the presence of

[Cu[H2O)4]2+ ions.

 

(i) When KF is added:

(ii) When KCl is added:

In both these cases, the weak field ligand water is replaced by the F - and Cl - ions.


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