КИСЛОТНО-ОСНОВНЫЕ СВОЙСТВА АЗОКРАСИТЕЛЕЙ В РАСТВОРАХ ПО ДАННЫМ СПЕКТРОФОТОМЕТРИИ И КОЛОРИМЕТРИИ

The acid-base properties of azo dyes of different structures in aqueous solutions were studied using the methods of colorimetry and spectrophotometry with chemometric data processing. A comparative analysis of the capabilities of both methods was carried out. It was established that it possible to determine the ionization constants of all the functional groups of the azo compounds studied using the data on the change in the specific color difference depending on the acidity of the medium. It was shown that the use of colorimetric functions of ion-molecule forms of azo-compounds as an analytical signal allows obtaining complete information of the acid-base equilibrium in a wide range of acidity.