Dye Indicator Absorbance Spectra and Complex Ions Formation in Solution

Abstract

The absorbance of a series of mixed dye, lead nitrate and alkali nitrates

solutions, dye concentration and one salt concentration constant and

increasing the concentration of the other salt, has been measured. The

absorbance at λ_max against the other salt concentration shows peaks corresponding to

complex ion formations between the salts; this can be explained

on the basis of Frank-Condon principle.