Since K1 for Cd(NH3)2+ is 3.55 ´ 102, log(K1) is 2.55. Thus, for a pNH3 greater than
2.55 (concentrations of NH3 less than 2.8 ´ 10–3 M), Cd2+ is the predominate
species. A complete ladder diagram for the metal–ligand complexes of Cd2+ and
NH3 is shown in Figure 6.6.