PVT properties of concentrated aqueous electrolytes: V. Densities and apparent molal volumes of the four major sea salts from dilute solution to saturation and from 0 to 100°C

Leslie M. Connaughton, J. Peter Hershey, Frank J. Millero

Research output: Contribution to journalArticle

97 Scopus citations

Abstract

The densities of the major sea salts (NaCl, Na2SO4, MgCl2, and MgSO4) have been measured from 25 to 95°C and to saturation. These results have been combined with literature data and fitted to equations of the form {Mathematical expression} where Δd=d-do (do is the density of water) and A, B, and C, etc., are polynomial functions of temperature. The standard deviations of the fits were better than ±50×10-6 g-cm-3 for all the salts from 0 to 95°C and to saturation. The apparent molal volumes Vφ{symbol} of the salts have been fitted to the equations of Pitzer. The infinite dilution values of Vφ{symbol} were in good agreement with literature data, provided the results were not overfit. The large deviations of Vφ{symbol} for MgSO4 from additivity as a function of concentration were attributed to the formation of MgSO4 ion pairs.

Original languageEnglish (US)
Pages (from-to)989-1002
Number of pages14
JournalJournal of Solution Chemistry
Volume15
Issue number12
DOIs
StatePublished - Dec 1 1986

Keywords

  • Densities
  • MgCl
  • MgSO
  • NaCl
  • NaSO
  • Pitzer theory
  • partial molal volumes

ASJC Scopus subject areas

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

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