Equilibria in the Ternary System NaCl–NaAc–H₂O at 303.15 K, 323.15 K, and 343.15 K

Click to copy article linkArticle link copied!

The solubilities and the physicochemical properties of NaCl–NaAc–H₂O (solid–liquid system) at 303.15 K, 323.15 K, and 343.15 K have been measured by the isothermal method. The phase diagrams were plotted according to the measured data. The system only contained the forms of single salts, and no double salts or solid solution. On the basis of the Pitzer model and the temperature coefficients of the single-salt parameters, the mixed ion-interaction parameters, θ_Cl^–Ac^– and φ_{Na⁺Cl^–Ac^–}, as well as the average equilibrium constants of the solids were obtained. Using the above parameters of the solids at equilibrium, the solubility and the activity coefficient predictions for the NaCl–NaAc–H₂O are presented. A comparison between the calculated and experimental results suggests that the solubility data predicted by the Pitzer model agree well with the experimental data.