title: Studies on equilibrium of anthranilic acid in aqueous solutions and in two-phase systems: aromatic solvent-water.
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.
authors.affiliation: Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, Rzeszów University of Technology, 6 Powstańców Warszawy Ave., 35-959 Rzeszów, Poland. lzapala@prz.rzeszow.pl
authors.forename: Lidia
authors.initials: L
authors.lastname: Zapała
authors.forename: Jan
authors.initials: J
authors.lastname: Kalembkiewicz
authors.forename: Elzbieta
authors.initials: E
authors.lastname: Sitarz-Palczak
mesh_terms: D000136:Acid-Base Equilibrium; D006863:Hydrogen-Ion Concentration; D011199:Potentiometry; D012997:Solvents / Q000737:chemistry*; D013053:Spectrophotometry; D014867:Water / Q000737:chemistry; D062367:ortho-Aminobenzoates / Q000737:chemistry*
chemical_list: D012997:Solvents; D062367:ortho-Aminobenzoates; D014867:Water; C031385:anthranilic acid