An empirical equation for the dielectric constant in aqueous and nonaqueous electrolyte mixtures

André Zuber, Lúcio Cardozo-Filho, Vladimir Ferreira Cabral, Ricardo Figueiredo Checoni, Marcelo Castier

Research output: Contribution to journalArticle

10 Citations (Scopus)


This work develops an empirical model to evaluate the dielectric constant of single or multi-solvents containing multiple ions, using only one adjustable parameter per ion. Correlations are performed for 35 salts in water, 9 in methanol, and 3 in ethanol. The dielectric constant of 9 two-solvent solutions (containing water, methanol, ethanol, 1-propanol, 2-propanol, or acetone) is predicted. In addition, predictions of the dielectric constant of a mixture containing water, methanol, and NaCl are presented. Besides the specific parameter for each ion, a general parameter for cations and another for anions, specific to the each solvent, are obtained. They are recommended for calculating the dielectric constant in solutions whose experimental data are unavailable in the literature.

Original languageEnglish
Pages (from-to)116-123
Number of pages8
JournalFluid Phase Equilibria
Publication statusPublished - 25 Aug 2014



  • Acetone
  • Alkanols
  • Dielectric constant
  • Electrolyte solutions
  • Water

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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