1971 Volume 44 Issue 3 Pages 697-700
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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