The Melting Curve of Sodium Chloride Dihydrate. An Experimental Study of an Incongruent Melting at Pressures Up to Twelve Thousand Atmospheres

Abstract

was found to be 1.630, and its mean compressibility between 6000 and 12,-000 bars at about 22°, 4.8 X 10-6 per bar. A method for calculating the heat of fusion from solubility data gives a value which is in fair agreement with that determined from the initial slope of the melting curve, the average value being 32 cal. per g. of NaCl-2H20.A secondary pressure increase, that is, a continued rise of pressure following a sudden increase, was observed at pressures near the maximum on the curve, and an explanation is given for this phenomenon.

Occurrence of methane hydrate in saturated and unsaturated solutions of sodium chloride and water in dependence of temperature and pressure

“…This means that at a particular temperature the solubility of NaC1-2HzOs will increase with pressure. However, from the experimental data of Adams et al (1930) and Janecke (1949) of this binary three-phase line, it can be concluded that in the region of interest (the range of the four phase line NaCE2HzOs-Hs-L-G) the mole fraction of NaCl in the liquid phase is not strongly influenced by pressure. We calculated that in the mole fraction of NaCl at the most a deviation of 0.05% can occur, and we therefore decided to apply Eq.…”

“…2HzOs-NaCls-Hs-L-G lies on the three-phase line NaC1. 2HzOs-NaCls-L. From the experimental data of Adams et al (1930) and Janecke (1949), we can derive the pressure dependence …”

Effects of pressure on aqueous chemical equilibria at subzero temperatures with applications to Europa

“…and is based on the experimental work of Adams and Gibson (1930). In this particular case, the discrepancies between model and experimental measurements varied between Ϫ0.06 and 0.57°C over the pressure range from 1 to 1000 bars (Fig.…”

“…A comparison of model-calculated and experimental-equilibrium temperatures over the pressure range from 1 to 1000 bars. Experimental data are from Hogenboom et al (1995Hogenboom et al ( , 1999 and Adams and Gibson (1930).…”

Effect of Pressure on Phase Equilibria in Binary Condensed Systems

“…Figure 5 shows the pressures (1 kilobar = 1000 bars) and temperatures at which NaCl -2H20 is in equilibrium with NaCl and its saturated solution [12], The curve may be represented by the equation which Na2S0 4 ' 10H20 is in equilibrium with Na2S 0 4 and its saturated solution are given graphically in Figure 6. The dots represent the data of Tammann [14,15] and of Block [13], and the circles represent unpublished values obtained by Adams and Gibson.…”