Vapour pressure and volumetric studies in aqueous solutions with ascorbate ions

Alexander Apelblat, Emanuel Manzurola

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Vapour pressures of water over saturated solutions of l-ascorbic acid and calcium-l-ascorbate were measured in the 280 K to 318 K temperature range and the activities of water, osmotic coefficients and the molar enthalpies of vaporization were derived from them. Densities of aqueous solutions of l-ascorbic acid, magnesium-l-ascorbate and calcium-l-ascorbate were determined at 5 K temperature intervals, from T = 288.15 K to T = 333.15 K. Densities served to evaluate the apparent molar volumes, V2,φ{symbol}(m,T), the cubic expansion coefficients, α(m,T) and the changes of isobaric heat capacities with respect to pressure, (∂CP / ∂P)T,m. They were qualitatively correlated with the changes in the structure of water when ascorbic acid and magnesium and calcium ascorbates are dissolved in it.

Original languageEnglish
Pages (from-to)7-16
Number of pages10
JournalJournal of Molecular Liquids
Volume131-132
Issue numberSPEC. ISS.
DOIs
StatePublished - 15 Mar 2007

Keywords

  • Apparent molar volumes
  • Aqueous saturated solutions
  • Calcium-l-ascorbate
  • Densities
  • Magnesium-l-ascorbate
  • Thermal expansibilities
  • Vapour pressures
  • Water activities
  • l-ascorbic acid

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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