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Question
Answer the following question.
How stability of the coordination compounds can be explained in terms of equilibrium constants?
Short/Brief Note
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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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