Abstract
A simple model for thermodynamic properties of water from subzero temperatures up to 373 K was derived at ambient pressure. The heat capacity of supercooled water was assessed as lambda transition. The obtained properties for supercooled water such as heat capacity, vapor pressure, density and thermal expansion are in excellent agreement with literature data. Activity of water on ice curve, independent of used electrolyte and Debye−Hückel constant applied in modeling, is also calculated. Thus, the ice curve activity of supercooled water can be used as a universal basis for thermodynamic modeling of aqueous solutions, precipitating hydrated and anhydrous solids. A simple model for heat capacity, density and thermal expansion of ice are also derived from 170 K up to melting point.
Highlights
The peculiar thermodynamic properties of supercooled water and its practical importance for modeling aqueous solution at subzero temperatures have been gaining more and more attention
The heat capacity of liquid water in the temperature range −35 to +100 °C was modeled from experimental data using three temperature ranges
It was found that the heat capacity data of Archer and Carter[12] was not at lower temperatures in agreement with the other literature data so it was not included in the assessment
Summary
The peculiar thermodynamic properties of supercooled water and its practical importance for modeling aqueous solution at subzero temperatures (e.g., ref1) have been gaining more and more attention. The thermodynamic properties of supercooled liquid water in equilibrium with ice Ih, that is, the ice curve, are generally obtained by the assessment of experimental ice curve data for one or more electrolytes. The calculated activity of water in subzero aqueous solutions will depend on the equation used for the Debye−Hückel constant. Both items reflect to the estimated vapor pressure of water solution at subzero temperatures, which is important in meteorological and climate models
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