PVT properties of concentrated aqueous electrolytes. II. Compressibilities and apparent molar compressibilities of aqueous NaCl, Na2SO4, MgCl2, and MgSO4 from dilute solution to saturation and from 0 to 50°C

Frank J. Millero, J. Ricco, Donald R. Schreiber

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47 Scopus citations

Abstract

The relative sound velocities (U-U°) of aqueous NaCl, Na2SO4, MgCl2, and MgSO4 solutions were measured from 0.05m to saturation and from 0 to 45°C. The sound speeds were combined with our earlier work and fitted to a function of molality and temperature to standard deviations within 0.3 m-sec-1. The adiabatic compressibilities, βs, were determined from the sound speeds and used to calculate adiabatic apparent molar compressibilities, Kφ{symbol},s, isothermal compressibilities, β, and apparent molar compressibilities, Kφ{symbol}, were determined from the adiabatic values using literature data for expansibilities and heat capacities. The values of Kφ{symbol} have been extrapolated to infinite dilution using an extended limiting law. The resulting K0 at various temperatures are in reasonable agreement with literature values. The results of this study have been combined with our earlier results to derive a secant bulk modulus equation of state for NaCl, Na2SO4, MgCl2, and MgSO4 solutions valid from 0 to 50°C and 0 to 1000 bar.

Original languageEnglish (US)
Pages (from-to)671-686
Number of pages16
JournalJournal of Solution Chemistry
Volume11
Issue number10
DOIs
StatePublished - Oct 1 1982

Keywords

  • MgCl
  • MgSO
  • NaCl
  • NaSO
  • compressibilities
  • equations of state
  • partial molar compressibilities
  • sound speeds

ASJC Scopus subject areas

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

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