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Hydrogen ion titration of oleic acid in aqueous media

Reversible hydrogen ion titration curves were obtained on heterogeneous phase systems consisting of oleic acid, sodium oleate, NaCl, and water. Effects of temperature were examined at 10, 25, 40 o C in 0.1 and 0.01 M NaCl solutions. Titration curves were characterized with two constant pH regions at 10 o C but with a single constant pH region at 25 and 40 o C. These constant pH regions corresponded to three-phase regions, compositions of which were estimated on the basis of titration data