Abstract
The freezing-point depressions of solutions of NaCl in normal and heavy water have been measured between 0.01 and 2m. Extrapolation of the isotope effect data to infinite dilution yields a new value for the heat of fusion of D2O at its melting point (−1507±3 cal-mole−1). The freezing-point data were employed to obtain osmotic coefficients at the feezing points of the solutions, which were corrected to rounded temperatures up to 40°C using the enthalpy data reported by Craft and Van Hook (previous paper). The data for H2O solution are in quantitative agreement with well-established results. Those for the D2O solvent establish the NaCl−D2O system as an isopiestic reference. In contrast to the statements of earlier authors, examination of the isotope-effect data reveals a\(\surd \overline m\) dependence within experimental error.
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Abstracted in part from a thesis submitted by Q.D.C. in 1975 to the Chemistry Department, University of Tennessee, in partial fulfillment of the requirements for the Ph.D. degree in Chemistry.
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Craft, Q.D., Van Hook, W.A. Isotope effects in aqueous systems. VI. partial molal free energies in NaCl−H2O−D2O by freezing-point measurements. The heat of fusion of D2O. J Solution Chem 4, 923–947 (1975). https://doi.org/10.1007/BF00645889
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DOI: https://doi.org/10.1007/BF00645889