Abstract
Abstract In this experiment, we studied the complex formation equilibria of the lead(II) ion with aspartic acid and iminodiacetic acid by using the polarographic method. In acetate buffer solutions (5.80>pH>3.70), the lead(II) ion forms one normal complex, PbX0, and two mixed ligand complexes involving the acetate ion, PbX(Ac)−and PbX(Ac)22−, with aspartic acid. On the other hand, with iminodiacetic acid, it forms a normal complex, PbX0, and only one mixed ligand complex, PbX(Ac)−. By observing the effects of the concentrations of the hydrogen ion, the acetate ion, and aspartic acid or iminodiacetic acid on the half-wave potential of the lead(II) ion, their formation constants were determined to be as follows: (Remark: Graphics omitted.)
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