Journal of Solution Chemistry

, Volume 12, Issue 9, pp 607–619 | Cite as

Osmotic coefficients and activity coefficients of aqueous hydrobromic acid solutions at 25°C

  • J. B. Macaskill
  • Roger G. Bates


The osmotic coefficients ϕ and activity coefficients γ± of aqueous solutions of HBr depend largely on emf measurements utilizing the silver-silver bromide electrode. There is evidence, however, that side reactions between AgBr and bromide ion render this electrode unreliable when the HBr molality (m) exceeds 2 mol-kg−1. It is shown, however, that the isopiestic vapor-pressure technique is capable of yielding data for HBr at higher molalities. New emf measurements of cells with hydrogen and AgBr/Ag electrodes at 25°C have been combined with literature data to recommend values for the activity coefficients of HBr in the dilute range. These have been supplemented by isopiestic measurements vs. NaCl and CaCl2 reference solutions in the range of HBr molalities from 0.7 to 6.2m. A table of ϕ and γ± at 25°C at round molalities from 0.005 to 6.0 is presented.

Key words

Electrolytes activity coefficient hydrobromic acid isopiestic osmotic coefficient 


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Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • J. B. Macaskill
    • 1
  • Roger G. Bates
    • 1
  1. 1.Department of ChemistryUniversity of FloridaGainesville

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