Abstract
The ultraviolet absorption spectra of lead tetraacetate solutions have been studied in mineral acid media. It has been found that in a medium of perchloric acid, lead tetraacetate solutions have a spectrum similar to that of bivalent lead, from which they differ only by the width of the absorption band. The formation of Pb(IV) phosphate complexes may be judged from variations in the absorption maximum position of tetravalent lead in phosphoric acid medium in dependence on the tetravalent lead and phosphoric acid concentration; these complexes result in a greater stability of tetravalent lead solutions in aqueous H 3PO 4 solutions. A comparison of the hydrochloric acid solution spectra with literature data has proved that in a medium containing more than 0.7 M HCl, lead tetraacetate (in concentrations of 2 · 10 −4 M) converts immediately into the complex ion [PbCl 6] 2−, decomposing later to chlorine and the lead(II) salt.
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