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the blue complex formed on addition of conc. nh4oh solutin to a cu2+ salt solution has the structure? options : a-[cu(nh3)4]2+ b-[cu(nh3)2]2+ c-[cu(nh3)3]2+ d-[cu(nh4)2]2+

the blue complex formed on addition of conc. nh4oh solutin to a cu2+ salt solution has the structure? options :
a-[cu(nh3)4]2+
b-[cu(nh3)2]2+
c-[cu(nh3)3]2+
d-[cu(nh4)2]2+

Grade:12th pass

1 Answers

Chemistry Expert - askIITians
askIITians Faculty 36 Points
3 years ago
The correct answer is A
[Cu(NH3)4]2+

In the reaction of Copper salt and NH4OH( made up of NH3 and H2O), copper(II) hydroxide is formed first, which later reacts with NH3 to give a blue colored complex as shown in the reactions

CuSO4(aq) + 2 NH3 (aq) + 2H2O(l) Cu(OH)2 + (NH4)2SO4
Pale blue solu. Pale blue solu.

Cu(OH)2 + NH3 [Cu(NH3)4]2+
Pale blue Dark blue complex

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