Thermodynamics of tri- and pentabromide anions in aqueous solution |
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| Authors: | R W Ramette Donald A Palmer |
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| Institution: | (1) Department of Chemistry, Carleton College, 55057 Northfield, MN;(2) Chemistry Division, Oak Ridge National Laboratory, 37831 Oak Ridge, TN |
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| 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,  H
o
=–5.90 kJ-mol
–1
, Cp
o
=–29 J-K
–1
-mol
–1
, and S
o
=3.6 J-K
–1
-mol
–1
; K
5
=37.7, H
o
=–13.0 kJ-mol
–1
, S
o
=–13.6 J-K
–1
-mol
–1
, with Cp
o
assumed zero. These results are used to reevaluate published emf results for the bromine/bromide couple. |
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| Keywords: | Bromine tribromide pentabromide aqueous thermodynamics equilibria |
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