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Molecular Dynamics simulations are performed on two sodium chloride solutionsin TIP4P water with concentrations c=1.36 mol/kg and c=2.10 mol/kg uponsupercooling. The isotherms and isochoresplanes are calculated. The temperatureof maximum density line and the limit of mechanical stability line are obtainedfrom the analysis of the thermodynamic planes. The comparison of the resultsshows that for densities well above the limit of mechanical stability, theisotherms and isochores of the sodium chloride aqueous solution shift to lowerpressures upon increasing concentration while the limit of mechanical stabilityis very similar to that of bulk waterfor both concentrations. We also find thatthe temperature of maximum density line shifts to lower pressures andtemperatures upon increasing concentration. Indications of the presence ofaliquid-liquid coexistence are found for both concentrations.

Effect of concentration on the thermodynamics of sodium chloride aqueous solutions in the supercooled regime