Thermodynamic Properties of the NaCl+H2O System. II. Thermodynamic Properties of NaCl(aq), NaCl⋅2H2(cr), and Phase Equilibria

• Published in: Journal of physical and chemical reference data Vol. 21; no. 4; pp. 793 - 829
• Main Author: Archer, Donald G.
• Format: Journal Article
• Language: English
• Published: 01.07.1992
• Subjects: FORMATION HEAT; THERMODYNAMIC PROPERTIES; Compressibility; Aqueous; Vapor pressure; Expansivity; Enthalpy; Partial molar; 0570; SODIUM CHLORIDES; PHASE EQUILIBRIA; Dehydration; Properties; Density; 0050; 0270; SPECIFIC HEAT; Thermodynamics; DATA COMPILATION; TEMPERATURE RANGE 0065−0273 K; EQUATIONS OF STATE; FREE ENERGY; 1090; Solubility; Activity coefficient; Heat capacity; 0040; Sodium chloride; Gibbs energy; MEDIUM PRESSURE; EVALUATED DATA; Sodium chloride dihydrate; 0990; Apparent molar properties; AQUEOUS SOLUTIONS; HIGH PRESSURE; Osmotic coefficient; Formation; TEMPERATURE RANGE 0273−0400 K; Equation of state; TEMPERATURE RANGE 0400−1000 K
• ISSN: 0047-2689; 1529-7845
• DOI: 10.1063/1.555915

Equations that described the thermodynamic properties of the NaCl+H2O system were obtained from a fit to experimental results for this system. The experimental results included in the fit spanned the range of temperature of approximately 250 to 600 K and, where available, the range of pressure from the vapor pressure of the solution to 100 MPa. New equations and/or values for the following properties are given in the present work: 1) Δ f G 0 m and Δ f H 0 m , for formation from the elements, for NaCl(cr) for 298.15 K and 0.1 MPa, 2) Δ f G 0 m and Δ f H 0 m from the elements, as well as S 0 m and C 0 p,m , all for 298.15 K, 0.1MPa, for NaCl⋅2H2O(cr), 3) the change in chemical potential for both NaCl and H2O in NaCl(aq) as a function of temperature, pressure, and molality, valid from 250 to 600 K and, where available, from the vapor pressure of the solution to 100 MPa. Comparison of the accuracies of experimental methods, where possible, has also been performed.