Abstract
New equations that describe the thermodynamic properties of the NaNO3+H2O system were obtained from previously published measurements for this system. The measured values included in the fitted equations spanned the range of temperatures of approximately 236–425 K for NaNO3(aq) and 16–548 K for NaNO3(cr). New equations and/or values for the following properties are given in the present work: (1) thermal properties of NaNO3(cr) from 0 K to near the lambda transition, 548.6 K, (2) the change in chemical potential for both NaNO3 and H2O in NaNO3(aq) as a function of temperature, and molality, valid from 236 to 425 K, and the molality range of 0 mol⋅kg−1 to the lesser of the saturation molality or 25 mol⋅kg−1, and (3) standard-state properties for the aqueous solution process.
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