Which of the following complexes formed by Cu ions is most stable?
A. Cu2+ + 4NH3 → [Cu(NH3)4]2+, log K = 11.6
B. Cu2+ + 4CN– → [Cu(CN4)]2-, logK = 27.3
C. Cu2+ + 2en → [Cu(en)2]2+, log K = 15.4
D. Cu2+ + 4H60 → [Cu(H2O)4]2+, log K = 8.9
Answer:D
Which of the following complexes formed by Cu ions is most stable?
A. Cu2+ + 4NH3 → [Cu(NH3)4]2+, log K = 11.6 B. Cu2+ + 4CN– → [Cu(CN4)]2-, logK = 27.3 C. Cu2+ + 2en → [Cu(en)2]2+, log K = 15.4 D. Cu2+ + 4H60 → [Cu(H2O)4]2+, log K = 8.9
Explanation: The greater the value of log K, the greater will be stability of complex compound formed. For reaction, log K has the highest value.