Ethylenediamine displaces H2O in the complex [Fe(H2O)6]3+ in three steps. [Fe(H2O)6]3++3en→[Fe(en)3]3++6H2O Stepwise formation constants are logK1=4.34 logK2=3.31 logK3=2.05 Overall formation constant is A×10B. A+B is ............
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Solution
First obtain the stepwise formation constants from logK values. logK1=4.34. Hence, K1=104.34 logK2=3.31. Hence, K2=103.31 logK3=2.05. Hence, K3=102.05
Now calculate the overall formation constant. K=K1×K2×K3=104.34×103.31×102.05=109.7=5×109, this is equal to A×10B.