THERMODYNAMIC PROPERTIES OF THE NACL+H2O SYSTEM .2. THERMODYNAMIC PROPERTIES OF NACL(AQ), NACL.2H2O(CR), AND PHASE-EQUILIBRIA

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) DELTA(f)G(m)-degrees and DELTA(f)H(m)-degrees, for formation from the elements, for NaCl(cr) for 298.15 K and 0.1 MPa, 2) DELTA(f)G(m)-degrees and DELTA(f)H(m)-degrees from the elements, as well as S(m)-degrees and C(p,m)-degrees, all for 298.15 K, 0.1 MPa, 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.