Abstract
Activity coefficients for HBr in HBr−NH4Br−H2O at 25°C have been measured at constant total molalities of 0.05, 0.1, 0.25, 0.5, 1.0, 2.0, and 3.0 mole-kg−1. The electromotive-force measurements of cells containing the hydrogen and the silver-silver bromide electrode were used to determine the variation of the logarithm of the activity coefficient of hydrobromic acid with the change in the amount of ammonium bromide in the solution. The results have been interpreted in terms of the Pitzer treatment of mixed electrolytes and are compared with those of Harned and Hamer for the HBr−KBr−H2O and HBr−NaBr−H2O systems. It is found that Harned's rule is a good description for both electrolytes.
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Roy, R.N., Swensson, E.E. Thermodynamic properties of strong electrolytes: The HBr−NH4Br−H2O system at 25°C. J Solution Chem 4, 431–440 (1975). https://doi.org/10.1007/BF00645575
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DOI: https://doi.org/10.1007/BF00645575