Investigations into the common ion effect

C. V. Valdeavella, John S. Perkyns, B. Montgomery Pettitt

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The molecular origins of the common ion effect and the salting out of nonpolar molecules from aqueous solutions are investigated. Thermodynamic stability criteria for a common ion mixture in a polar solvent are derived. Kirkwood-Buff statistical thermodynamics is used to make the connection with the microscopic pair correlation functions. The observed sensitivity of the compositional stability with respect to ionic strength indicates that a demixing transition is the primary cause of the instability for the common ion effect for our model Lennard-Jones plus Coulomb Hamiltonian.

Original languageEnglish (US)
Pages (from-to)5093-5109
Number of pages17
JournalThe Journal of Chemical Physics
Volume101
Issue number6
DOIs
StatePublished - Jan 1 1994

ASJC Scopus subject areas

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

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