Partial molal heat capacities of tetraalkylammonium bromides in methanol from 10 to 50°C |
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Authors: | Charles Shin C M Criss |
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Institution: | (1) Department of Chemistry, University of Miami, 33124 Coral Gables, Florida |
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Abstract: | Enthalpies of solution habe beenmeasured for tetraethyl-, tetra-n-propyl-, and tetra-n-butylammonium bromides in anhydrous methanol at several temperatures ranging from 5 to 55°C. The data were extrapolated to
infinite dilution by an extended Debye-Hückel equation to obtain standard enthalpies of solution ΔH
3
0
, and the integral heat method was employed to obtain partial molal heat capacities
, of the corresponding salts from 10 to 50°C. These data, along with similar data for tetramethylammonium bromide previously
reported, were used to assign an, absolute heat capacity to the bromide ion in anhydrous methanol. Comparison of the absolute
heat capacities of the bromide and tetraalkylammonium ions in water and methanol suggests that the processes occurring in
the two solvents are quite dissimilar. |
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Keywords: | Tetraalkylammonium bromides partial molal heat capacities enthalpies of solution structure effect methanol solutions temperature effect absolute ionic heat capacities |
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