Dissociation constants of parabens and limiting conductances of their ions in water

Ana Kroflič, Alexander Apelblat, Marija Bešter-Rogač

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Precise measurements of electrical conductivities of methylparaben, ethylparaben, propylparaben, and butylparaben sodium salts in dilute aqueous solutions were performed from 278.15 to 313.15 K in 5 K intervals. Experimental conductivity data were analyzed applying the Quint-Viallard conductivity equations by taking into account the salt hydrolysis in aqueous solutions. These evaluations yield the limiting conductances of paraben anions and the dissociation constants of the investigated parabens in water. From temperature dependence of dissociation constants, the thermodynamic functions associated with the dissociation process were estimated. It was discovered that the contributions of enthalpy and entropy to the Gibbs free energy are quite similar. The Walden products of paraben anions in water are independent of temperature, indicating that the hydrodynamic radii are not significantly affected by temperature.

Original languageEnglish
Pages (from-to)1385-1392
Number of pages8
JournalJournal of Physical Chemistry B
Issue number4
StatePublished - 2 Feb 2012

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


Dive into the research topics of 'Dissociation constants of parabens and limiting conductances of their ions in water'. Together they form a unique fingerprint.

Cite this