Summary
A Microcomputer-Controlled Microcalorimeter Calibration Circuit
3. Enthalpies of Solution of Linear and Cyclic Alkanes in Glacial Acetic Acid
The molar enthalpy of solution ofn-alkanes and cycloalkanes has been studied in an isoperibol calorimeter at 25.0 °C. Reasoning from a purely volumetric effect of intrusion of solute molecules into an associated solvent, we might expect compact cycloalkane molecules to disturb the solvent structure less than linear alkanes and to have a smaller exothermic enthalpy of solution than then-alkanes. That is not the case, evidently, as the cyclic compounds mix with aΔH s that is exothermic in the same degree as their linear counterparts. These results are discussed in terms of a model in which each alkane molecule occupies a cavity in the structured solvent that is large with respect to itself. Enthalpy of solution of saturated alkanes in glacial acetic acid does not depend on the geometry of the alkane for the two homologous series studied thus far.
Similar content being viewed by others
References
R. B. Williams, J. Amer. Chem. Soc.64, 1395 (1942);
T. Flitcroft, H. A. Skinner, and M. C. Whiting, Trans. Far. Soc.53, 784 (1957);
H. A. Skinner and A. Snelson,ibid 55, 404 (1959);
E. Bretschneider and D. W. Rogers, Mikrochim. Acta [Wien]1970, 482;
R. Fuchs and L. A. Peacock, J. Phys. Chem.83, 1975 (1979);
D. W. Rogers, L. S. Choi and J. A. Beauregaard, Mikrochim. Acta [Wien]1980 I, 245.
J. D. Cox and G. Pilcher, The Thermochemistry of Organic and Organometallic Compounds, New York: Academic Press 1970.
R. B. Turner, W. R. Meador, and R. E. Winkler, J. Amer. Chem. Soc.79, 4116 (1957) and subsequent papers to R. B. Turner, A. D. Jarrett, P. Goebel, and B. J. Mallon, J. Amer. Chem. Soc.95, 790 (1973).
D. W. Rogers, B. Munoz-Hresko, and R. R. Mandra, Mikrochim. Acta [Wien]1984 II, 417.
R. M. Izatt, L. D. Hansen, D. J. Eatough, T. E. Jensen, and J. J. Christiansen, in: R. S. Porter and J. F. Johnson, eds., Analyt. Calorimetry, Vol. 3, New York: Plenum Press, 1974, p. 237 ff.
P. W. Carr, W. D. Bostic, L. M. Canning, and R. H. Callicott, Amer. Lab.8, 45 (1976);
A. J. Head, Combustion and Reaction Calorimetry in Chemical Thermodynamics Specialist Periodical Reports, London: The Chemical Society, 1973, p. 96.
D. W. Rogers and S. C. Patel, Mikrochim. Acta [Wien]1982 II, 383.
M. J. Kamlet, R. Doherty, R. W. Taft, and M. H. Abraham, J. Amer. Chem. Soc.105, 6741 (1983).
J. H. Hildebrand, J. M. Prausnitz, and R. L. Scott, Regular and Related Solutions, Van Nostrand Reinhold, N. Y., 1970;
G. Skatchard, Chem. Rev.8, 321 (1931);
A. F. M. Barton, Chem. Rev.75, 731 (1975).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rogers, D.W., Kim, J.H., Patel, S.C. et al. A microcomputer-controlled microcalorimeter calibration circuit. Mikrochim Acta 87, 297–306 (1985). https://doi.org/10.1007/BF01196828
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01196828