Electrical conductance and volumetric studies in aqueous solutions of nicotinic acid

Zoya Orekhova, Meyrav Ben-Hamo, Emanuel Manzurola, Alexander Apelblat

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37 Scopus citations

Abstract

Conductivity measurements of nicotinic acid and sodium nicotinate in dilute aqueous solutions were performed in the (288.15 to 323.15) K temperature range. The limiting equivalent conductances of the nicotinate anion, λ 0(Nic-, T), and the dissociation constants of nicotinic acid, K(T), were derived by the use of the Onsager and the Quint and Viallard conductivity equations. Densities of aqueous solutions with molalities lower than 0.2 mol-kg-1 were determined at 5 K temperature intervals, from T = (288.15 to 333.15) K. The measured densities were used to evaluate the apparent molar volumes, V 2, φ(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 nicotinic acid is dissolved in it.

Original languageEnglish
Pages (from-to)687-700
Number of pages14
JournalJournal of Solution Chemistry
Volume34
Issue number6
DOIs
StatePublished - 1 Jun 2005

Keywords

  • Apparent molar volumes
  • Aqueous solutions
  • Densities
  • Dissociation constants
  • Limiting equivalent conductances
  • Nicotinic acid
  • Sodium nicotinate
  • Thermal expansibilities

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