SELECT * FROM question_mgmt as q WHERE id=1940 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) CBSE Free NCERT Solution of 12th chemistry Coordination Compounds what is the coordination entity formed when excess

Question:

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g) is passed through this solution?

Answer:

CuSO4(aq)  +  4KCN(aq)   →  K2[Cu(CN)4](aq)  +  K2SO4(aq) 

i.e., [Cu(H2O)4]2+   +   4CN-     →  [Cu(CN)4]2-  + 4H2O 

 

Thus, the coordination entity formed in the process is K2[Cu(CN)4]. K2[Cu(CN)4 is a very stable complex, which does not ionize to give Cu2+ ions when added to water. Hence, Cu2+ ions are not precipitated when H2S(g) is passed through the solution.


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