Thermochemical investigations of the water-ethanol and water-methanol solvent systems. I. Heats of mixing, heats of solution, and heats of lonization of water

Gary L. Bertrand, Frank J Millero, Ching Hsien Wu, Loren G. Hepler

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Abstract

Differential heats of solution (L) of water and ethanol in various solvents ranging from pure water to pure ethanol have been determined by measuring heats of solution of small quantities of pure water and ethanol in large quantities of the various solvents. Partial molal entropies, based on the pure liquids as standard states, have been calculated for ethanol in water and water in ethanol. The standard (hypothetical l m solution) partial molal entropy, heat of formation, and free energy of formation have been calculated for aqueous ethanol. The entropy data show that addition of small amounts of ethanol to water increases the structuredness of the solutions. Heats of solution of NaCl(c) have been determined in various water-ethanol mixtures. Heats of solution of aqueous HCl and aqueous NaOH have also been determined and used in calculating ΔH values for solution of HCl(g) and NaOH(c) in the various solvent mixtures. The ΔH values for solution of NaCl(c), NaOH(c), and HCl(g) all show maxima in the water-rich region, while those for HCl(g) also show a minimum in the ethanol-rich region. Heats of reaction of NaOH with HCl have been measured and used in calculating heats of ionization of water in the various solvent mixtures. The resulting ΔH values show a small maximum in the water-rich region. Some similar work has been done on water-methanol systems.

Original languageEnglish (US)
Pages (from-to)699-705
Number of pages7
JournalJournal of Physical Chemistry
Volume70
Issue number3
StatePublished - 1966
Externally publishedYes

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heat of solution
Methanol
Ethanol
ethyl alcohol
methyl alcohol
heat
Water
water
Entropy
entropy
Hot Temperature
heat of formation
energy of formation
Free energy
Ionization
free energy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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Thermochemical investigations of the water-ethanol and water-methanol solvent systems. I. Heats of mixing, heats of solution, and heats of lonization of water. / Bertrand, Gary L.; Millero, Frank J; Wu, Ching Hsien; Hepler, Loren G.

In: Journal of Physical Chemistry, Vol. 70, No. 3, 1966, p. 699-705.

Research output: Contribution to journalArticle

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