Abstract
Enthalpies of solution have been measured from 5 to 85°C for aqueous tetraethyl- and tetrapropylammonium bromides, and the integral heat method is employed to evaluate\(\bar C_{p_{_2 } }^ \circ \) for these electrolytes over a wide temperature range. Data taken from the literature have been used to evaluate\(\bar C_{p_{_2 } }^ \circ \) for aqueous Bu4NBr over a similar temperature range. These data, along with similar data for Me4NBr, previously reported, have been used to evaluate absolute ionic heat capacities. While the absolute values agree only qualitatively with two other methods of division, the temperature dependences of the three methods essentially agree up to 65°C. Heat capacities due to structural effects on the solvent, obtained by subtracting the inherent heat capacities of the ions, are extraordinarily positive for all four tetraalkylammonium ions and have negative temperature coefficients, indicating that all four ions, including the tetramethylammonium ion, are structure-making ions.
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References
H. Rüterjans, F. Schreiner, U. Sage, and T. Ackermann,J. Phys. Chem. 73, 986 (1969).
M. J. Mastroianni and C. M. Criss,J. Chem. Thermodyn. 4, 321 (1972).
C. De Visser and G. Somsen,J. Chem. Thermodyn. 5, 147 (1973).
C. De Visser and G. Somsen,J. Chem. Soc. Faraday Trans. 1 69, 1440 (1973).
J. Desnoyers and G. Perron, private communication.
M. Eigen and E. Wicke,Z. Elektrochem. 55, 354 (1951).
T. Ackermann,Disc. Faraday Soc., No.24, 180 (1957).
C. M. Criss and J. W. Cobble,J. Am. Chem. Soc. 83, 3223 (1961).
E. C. Jekel, C. M. Criss, and J. W. Cobble,J. Am. Chem. Soc. 86, 5404 (1964).
R. E. Mitchell and J. W. Cobble,J. Am. Chem. Soc. 86, 5401 (1964).
J. C. Ahluwalia and J. W. Cobble,J. Am. Chem. Soc. 86, 5377 (1964).
M. J. Mastroianni and C. M. Criss,J. Chem. Eng. Data 17, 222 (1972).
J. A. Burns and R. E. Verrall,Thermochim. Acta 9, 277 (1974).
A. K. R. Unni, L. Elias, and H. I. Schiff,J. Phys. Chem. 67, 1216 (1963).
C. Shin and C. M. Criss,Rev. Sci. Instrum. 46, 1043 (1975).
H. C. Dickinson,U.S. Bur. Stand. Bull. 11, 189 (1914).
G. S. Kell,J. Chem. Eng. Data 12, 66 (1967).
B. B. Owen, R. C. Miller, C. E. Milner, and H. L. Cogan,J. Phys. Chem. 65, 2065 (1961).
Y. C. Wu and H. L. Friedman,J. Phys. Chem. 70, 2020 (1966).
E. M. Arnett and D. R. McKelvey,J. Am. Chem. Soc. 88, 2598 (1966).
C. V. Krishnan and H. L. Friedman,J. Phys. Chem. 73, 3934 (1969).
R. H. Boyd and P. S. Wang, Abstracts of Papers of the 155th National Meeting of the American Chemical Society, San Francisco, California, April, 1968, No. S128.
R. M. Noyes,J. Am. Chem. Soc. 86, 971 (1964).
C. M. Criss and J. W. Cobble,J. Am. Chem. Soc. 86, 5390 (1964).
C. Jolicoeur, P. R. Philip, G. Perron, P.-A. Leduc, and J. E. Desnoyers,Can. J. Chem. 50, 3167 (1972).
B. E. Conway, R. E. Verrall, and J. E. Desnoyers,Trans. Faraday Soc. 62, 2738 (1966).
L. A. K. Staveley, J. B. Warren, H. P. Paget, and D. J. Dowrick,J. Chem. Soc., 1992 (1954).
H. L. Finke, M. E. Gross, G. Waddington, and H. M. Huffman,J. Am. Chem. Soc. 76, 333 (1954).
J.-L. Fortier, P.-A. Leduc, and J. E. Desnoyers,J. Solution Chem. 3, 323 (1974).
R. L. Kay and D. F. Evans,J. Phys. Chem. 70, 2325, 2336 (1966).
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Shin, C., Worsley, I. & Criss, C.M. Partial molal heat capacities of aqueous tetraalkylammonium bromides as functions of temperature. J Solution Chem 5, 867–879 (1976). https://doi.org/10.1007/BF01167240
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DOI: https://doi.org/10.1007/BF01167240