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Isotope effects in aqueous systems. V. Partial molal enthalpies of solution of NaCl−H2O−D2O and related systems (5 to 75°C)1

Abstract

Solvent isotope effects on differential heats of solution of NaCl in HOH and DOD have been measured between 0.01 and 4m and from 5 to 40°C. These data are supplemented by integral heats of solution measured at 0.465m and from 5 to 75°C, and with heats of dilution over the same temperature range. The integral heat measurements include studies on otheralkali halides (KCl, NaI, NaBr), and the dilution measurements include some data for KCl. In the NaCl studies, particular attention was paid to the low-concentration region. Values of the partial molal enthalpiesL 1 adL 2 are derived for solution in both isotopic waters, and new values for the isotope effect on the standard enthalpy of solution ΔL 2 s = (ΔH 2 0 ) dw as a function of temperature are reported. Comparisons are made with previous work where possible. In contrast to statements made by earlier authors, examination of the low-concentration data reveals a\(\surd \overline m\) dependence within experimental error.

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Author information

Correspondence to W. Alexander Van Hook.

Additional information

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. V. Partial molal enthalpies of solution of NaCl−H2O−D2O and related systems (5 to 75°C)1 . J Solution Chem 4, 901–922 (1975). https://doi.org/10.1007/BF00645888

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Key words

  • Solvent isotope effects
  • partial molal enthalpy
  • D2O
  • heat of solution
  • heat of dilution
  • enthalpy
  • thermodynamic property
  • NaCl
  • KCl
  • Nal
  • NaBr
  • calorimetry
  • solution calorimetry