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What do you understand by the term stabi...

What do you understand by the term stability constant, Ks of a complex ? Knowing that the value of Ks for `[Cu(NH_3)_4]^(2+)" is " 4.5 xx 10^11` and for `[Cu(CN)_4]^(2-)" is " 2.0 xx 10^27`. Suggest (a) which complex species will furnish less `Cu^(2+)` ions in solution and (b) which out of `NH_3 and CN^(-)` is a stronger base ?

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