Cryoscopic and volumetric studies in the maleic acid + water system

Alexander Apelblat, Emanuel Manzurola

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Freezing points of aqueous solutions of maleic acid were determined. They served to obtain water activities and osmotic and activity coefficients at freezing temperatures. The integration of the Gibbs - Duhem equation was performed by taking into account the dissociation of maleic acid. Densities of (0.09831, 0.4902, and 0.9790) mol·kg-1 maleic acid solutions were measured at 5 K intervals from T = (288.15 to 333.15) K, and they are compared with the literature results. From the determined densities, the apparent molar volumes, the cubic expansion coefficients, and the second derivatives of volume with respect to temperature which are interrelated with the derivatives of isobaric heat capacities with respect to pressure were evaluated. These derivatives were qualitatively correlated with the changes in the structure of water when maleic acid is dissolved in it.

Original languageEnglish
Pages (from-to)333-337
Number of pages5
JournalJournal of Chemical and Engineering Data
Issue number2
StatePublished - 12 Feb 2009

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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