Abstract
Formation constants for the tribromide and pentabromide anions were measured by a vapor partitioning method from 5 to 80°C. The molal thermodynamic parameters for these respective species at 25°C are: K 3 −16.73, ΔHo=−5.90 kJ-mol−1, ΔCpo=−29 J-K−1-mol−1, and ΔSo=3.6 J-K−1-mol−1; K 5 =37.7, ΔHo=−13.0 kJ-mol−1, ΔSo=−13.6 J-K−1-mol−1, with ΔCpo assumed zero. These results are used to reevaluate published emf results for the bromine/bromide couple.
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Ramette, R.W., Palmer, D.A. Thermodynamics of tri- and pentabromide anions in aqueous solution. J Solution Chem 15, 387–395 (1986). https://doi.org/10.1007/BF00646261
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DOI: https://doi.org/10.1007/BF00646261