Thermodynamic Effects of Mixing Light and Heavy Water

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Abstract
The thermodynamic functions for the isotopic exchange reaction H2O+D2O=2HDO in the gas and liquid states are computed from recent experimental data. They differ from previously published values. Excess functions for liquid mixtures of the water isotopes are derived. For ideal solutions of the water isotopes, these functions can be evaluated numerically. The calculated excess enthalpy of mixing is in agreement with the experimental heat of mixing. The possibility of nonideal behavior of isotopic water solutions is discussed.