Abstract
The solubility of three dicarboxylic acids, (COOH)−(CH2)n−(COOH) (n = 6, 7, 8), was determined in NaCl(aq) (0.5 to 4.5) mol·L-1, (CH3)4NCl(aq) (0.25 to 3) mol·L-1, (C2H5)4NI (0.25 to 1) mol·L-1, and in pure water at t = 25 °C. The solubility trend is (C2H5)4NI > (CH3)4NCl > NaCl. The Setschenow constants and activity coefficients of neutral species were calculated from these data. To fully characterize the acid−base behavior of above dicarboxylic acids, the protonation constants were determined in the same conditions. From these data, together with solubility ones, Pitzer and SIT parameters were calculated.
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