Formation Constants, Kf, of Complex Ions
M(H2O)42+(aq) + 4NH3(aq) M(NH3)42+(aq) + 4H2O(l)
Kc = [M(NH3)42+][H2O]4/[M(H2O)42+][NH3]4
Kf = Kc/[H2O]4 = [M(NH3)42+]/[M(H2O)42+][NH3]4
In fact, four sequential reactions occur, defined by four Kf values,
for the systematic substitution of H2O ligands by NH3 ligands.
Thus, Kf = Kf1 x Kf2 x Kf3 x Kf4
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