Densities and compressibilities of aqueous sodium carbonate and bicarbonate from 0 to 45°C

J. Peter Hershey, Sara Sotolongo, Frank J. Millero

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


The densities and the sound speeds of aqueous NaHCO3 and Na2CO3 solutions were measured from 0.05 to 1.0m and from 0 to 45°C. These data were fitted to functions of molality and temperature and were used to calculate the apparent molal volumes Vφ{symbol} and compressibilites κφ of these solutions. Polynomial expression for Vφ{symbol} and κφ as functions of molality and temperature have been determined. The partial molal volumes and compressibilities of these solutions and literature data have been used to determine the volume ΔV and compressibility Δκ changes for the ionization of carbonic acid in aqueous solutions. These values of ΔV and Δκ have been used to estimate the effect of pressure on the ionization constants for carbonic acid from 0 to 45°C. The calculated pressure coefficients are in good agreement with the measured values.

Original languageEnglish (US)
Pages (from-to)233-254
Number of pages22
JournalJournal of Solution Chemistry
Issue number4
StatePublished - Apr 1 1983


  • NaCO
  • NaHCO
  • carbonic acid
  • compressibility
  • density
  • ionization
  • partial molal volume
  • pressure effects
  • sound speed

ASJC Scopus subject areas

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


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