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Abstract
The acid–base equilibria of anthranilic acid have been characterized in terms of macro- and microdissociation constants (dissociation constants K a1, K a2 and tautomeric constant K z). On the basis of spectrophotometric investigations the values of the distribution ratio D of anthranilic acid in the two-phase systems: aromatic solvent (benzene, ethylbenzene, toluene, chlorobenzene, bromobenzene)–aqueous solution were obtained. Employing the results of potentiometric titration in the two-phase systems: aromatic solvent–aqueous solution the distribution constant K D and dimerization constant K dim values were calculated. The influence of organic solvent polarity and pH of the aqueous phase on the contents of the particular forms of the acid in the two-phase systems were analyzed.
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