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),(CH_3)_4NCl(aq),and(C_2H_5)4NI(aq)at Different Ionic Strengths

摘要

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 centre dot L~(-1),(CH_3)_4NCl(aq)(0.25 to 3)mol centre dot L~(-1),(C_2H_5)_4NI(0.25 to 1)mol centre dot L~(-1),and in pure water at t = 25 deg C.The solubility trend is(C_2H_5)_4NI >(CH_3)_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.