Abstract
The use of 1,4-dihydroxyanthraquinone as an acid-base indicator in isopropyl alcohol medium is proposed. The acid dissociation constants of the indicator in isopropyl alcohol solution are p K a1 = 12.95 ± 0.03 and p K a2 = 15.96 ± 0.07. The sharpness of the indicator transition is described by means of complementary chromaticity parameters. The indicator is used for determination of weak organic acids, with errors of less than 1%.
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