Solubility and activity coefficients of acidic and basic nonelectrolytes in aqueous salt solutions. 2. Solubility and activity coefficients of suberic, azelaic, and sebacic acids in NaCl(aq), (CH3)(4)NCl(aq), and (C2H5)(4)NI(aq) at different ionic strengths and at t=25 degrees C

The solubility of three dicarboxylic acids, (COOH)-(CH2)n-(COOH) (n ) 6, 7, 8), was determined in NaCl(aq) (0.5 to 4.5) molâL-1, (CH3)4NCl(aq) (0.25 to 3) molâL-1, (C2H5)4NI (0.25 to 1) molâL-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.