Equilibrium solubility of sodium 2-naphthalenesulfonate in binary (sodium chloride plus water), (sodium sulfate plus water), and (ethanol plus water) solvent mixtures at temperatures from (278.15 to 323.15) K

摘要

The equilibrium solubility of sodium 2-naphthalenesulfonate in binary (sodium chloride + water), (sodium sulfate + water), and (ethanol + water) solvent mixtures was measured at elevated temperatures from (278.15 to 323.15) K using a steady-state method. With increasing temperatures, the solubility increases in aqueous solvent mixtures. The results of these results were regressed by a modified Apelblat equation. The dissolution entropy and enthalpy determined using the method of the least-squares and the change of Gibbs free energy calculated with the values of Delta S-diff(o) and Delta H-diff(o) at T = 278.15 K. (C) 2014 Elsevier Ltd. All rights reserved.