PVT properties of concentrated electrolytes. VI. The speed of sound and apparent molal compressibilities of NaCl, Na2SO4, MgCl2, and MgSO4 solutions from 0 to 100°C

Frank J. Millero, Faina Vinokurova, Marino Fernandez, J. Peter Hershey

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

The sound velocities of aqueous NaCl, Na2SO4, MgCl2, and MgSO4 solutions were measured from 25 to 95°C in 10o intervals from dilute to saturated solutions. The results were combined with our earlier data and fitted to functions of molality and temperature to within ±0.4 m-sec-1. The adiabatic compressibilities βS were calculated from sound speeds and used to calculate the adiabatic apparent molal compressibilities ξφ. Isothermal compressibilities β and isothermal apparent molal compressibilities χφ were calculated from βS using literature values for the expansibilities and heat capacities. The values of χφ were extrapolated to infinite dilution using the Debye-Huckel limiting law to determine partial molal compressibilities. The apparent molal compressibilities were fitted to Pitzer's equations. The Pitzer parameters for the concentration dependence of χφ were determined as a function of temperature. Correlations of χφ and Vφ at various temperatures were found for the electrolytes.

Original languageEnglish (US)
Pages (from-to)269-284
Number of pages16
JournalJournal of Solution Chemistry
Volume16
Issue number4
DOIs
StatePublished - Apr 1 1987

Keywords

  • MgCl
  • MgSO
  • NaCl
  • NaSO
  • Pitzer theory
  • Sound speeds
  • compressibilities
  • partial molal compressibilities

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Physical and Theoretical Chemistry

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