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Question
Answer the following question.
How stability of the coordination compounds can be explained in terms of equilibrium constants?
Short Note
Solution
The stability of the complex can be explained in terms of K. Higher the value of K larger is the thermodynamic stability of the complex. The equilibria for the complex formation with the corresponding K values are given below.
\[\ce{Ag+ + 2CN- -> [Ag(CN)2]-}\] K = 5.5 ×1018
\[\ce{Cu^2+ + 4CN- -> [Cu(CN)4]^2-}\] K = 2.0 ×1027
\[\ce{Co^3+ + 6NH3 -> [Co(NH3)6]^3+}\] K = 5.0 ×1033
Among the above equilibrium constant data, [Co(NH3)6] 3+ is more stable than [Ag(CN)2]– and [Co(NH3)6]3+ because [Co(NH3)6]3+ has higher value of equilibrium constant.
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Stability of the Coordination Compounds
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