Transitions in the speed of sound in concentrated aqueous electrolyte solutions

Frank J. Millero, Marino Fernandez, Faina Vinokurova

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Precise sound speed measurements on concentrated aqueous solutions of LiCl, MgCl2, CaCl2, SrCl2, and BaCl2 show positive transitions. These transitions occur respectively at 10.7 ± 0.7, 3.8 ± 0.6, 5.9 ± 0.5, 2.1 ± 0.2, and 0.9 ± 0.4 m for LiCl, MgCl2, CaCl2, SrCl2, and BaCl2 solutions. No transitions were found in the densities of these solutions. These transitions may be attributed to changes in the hydration structure around the cations. Since the sound speeds increase, the adiabatic compressibilities and partial molal compressibilities will decrease at the transition. This would lead to an increase in the hydration numbers, if one uses a simple model for the water structure around the ions.

Original languageEnglish (US)
Pages (from-to)1062-1064
Number of pages3
JournalJournal of physical chemistry
Volume89
Issue number7
DOIs
StatePublished - Jan 1 1985

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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