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Abstract
Heterogeneous equilibria in saturated aqueous solutions of 8-hydroxyquinoline (A), 2-methyl-8-hydroxyquinoline (B) and 5-chloro-8-hydroxyquinoline (C) were investigated at constant ionic strength (1 M sodium chloride), at 25.0 ± 0.1°, by the application of the following methods: the formation function method, the method of bound protons, the method of free proton sites and the solubility method. The following equilibrium constants were determined: K s1=[H 2A +]/[H 3O +], K s2=[HA] and K s3=[H 3O +] [A −]. Their mean pK values are: −2.88, 2.42 and 12.09 for A, −3.27, 2.71 and 12.73 for B, and −0.34, 3.88 and 12.75 for C. In addition, the acidity constants of investigated 8-hydroxyquinolines were determined by pH-metric titrations. The values obtained for these constants were consistent with those calculated on the basis of corresponding equilibrium constants determined in heterogeneous systems.
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