Investigations into the common ion effect

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

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


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
Issue number6
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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