Thermodynamics of mixed salt solutions: Excess Gibbs energies of mixing for the six ternary systems formed from aqueous MgCl2, Mg(NO3)2, CaCl2, and Ca(NO3)2 at 25°C

Thermodynamic Properties and Phase Equilibria in the H2O–Ca(NO3)2 System

“…There is a large amount of information on the activities of water and dissolved salt in the H 2 O–Ca­(NO 3 ) 2 system ,,,,,,,, in the literature. The data of various authors are summarized in reference books ,,, and reviews, , among which the article by Oakes et al stands out for its thoroughness.…”

“…(a) Water activity ( a 1 ) and (b) mean ionic activity coefficient (γ ± ) of diluted Ca­(NO 3 ) 2 solution at 298.15 K. Solid line () represents the values, calculated by PSC model I, built without data of Valenzuela et al Dashed line (---) represents the values, calculated by PSC model II, built with data of Valenzuela et al Experimental points: blue ◇, ref ; red +, ref ; black ○, ref ; blue ○, ref ; black □, ref ; black △, ref .…”

“…Dashed line (---) represents calculations in the metastable region. Experimental points: red +, ref ; red ○, ref ; black ○, ref ; blue ○, ref ; green ○, ref ; black □, ref ; green ◇, ref .…”

A Pitzer Parametrization To Predict Solution Properties and Salt Solubility in the H–Na–K–Ca–Mg–NO3–H2O System at 298.15 K

“…This is necessary because in some ternary systems (see the K–Ca–NO 3 ternary system) the molalities of Ca­(NO 3 ) 2 can be higher than the solubility limit of the binary system. The interaction parameters were optimized on the osmotic coefficient data measured by El Guendouzi and Marouani, Platford, Robinson, and Stokes . In Figure , we plotted the osmotic coefficient and the mean activity coefficient for the binary system.…”

Thermodynamic properties of aqueous calcium nitrate {Ca ( NO3)2}to the temperature 373 K including new enthalpy of dilution data

“…(37) The data of Stokes and Robinson (4) at T = 298.15 K for which H 2 SO 4 (aq) was the standard, have been recalculated using the H 2 SO 4 (aq) model of Rard et al (38) The data of Platford, (7) for which CaCl 2 (aq) was used as the standard, have been recalculated according to the Holmes et al (39,40) model. Platford's (7) osmotic coefficients obtained using MgCl 2 (aq) as the standard were fit as calculated by Platford. The data of Braunstein and Braunstein (6) were recalculated using their isopiestic molalities for LiNO 3 (aq) and the model of Simonson and Pitzer.…”