The van der Waals differential equation

General form of the van der Waals differential equation for binary systems:

The van der Waals differential equation can be used to calculate the slope of a phase boundary when the enthalpy of trantition H^1→2 is known, or to calculate the enthalpy from the slope of the phase boundary:

References:

• van der Waals, J. D.; Kohnstamm, P. Lehrbuch der Thermostatik:das heisst des thermischen Gleichgewichtes materieller Systeme. Leipzig, 1927.
• Kocherbitov, V.; Söderman, O.; Wadsö, L. J.Phys.Chem.B. (2002), 106 (11): 2910-2917.
• Kocherbitov, V. Thermochim.Acta (2004), 421(1-2), 105-110.
• Kocherbitov, V. J.Phys.Chem.B. (2005), 109, 6430-6435.

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(C) V.Kocherbitov, 2015