Abstract
The ionization constant of benzoic acid has been determined by conductivity measurements of dilute aqueous solutions and found to vary from 6.27×10−5 at 25°C to 0.39×10−5 at 250°C. The pressure effect to 2000 bar has been measured, and the ratio of ionization constants K2000/K1 is 2.26 at 25°C and 7.3 at 250°C. ΔV°1, the standard partial molar volume change for the ionization at 1 bar, varies from −11.7 cm3-mol−1 at 25°C to −60 cm3-mol−1 at 250°C. The volume changes are smaller at higher pressures.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
L. P. Hammett,Physical Organic Chemistry, 2nd ed. ((McGraw-Hill, New York, 1970).
R. A. Robinson and R. H. Stokes,Electrolyte Solutions, 2nd ed. (Butterworths, London, 1968).
B. S. Smolyakov and M. P. Primanchuk,Russ. J. Phys. Chem. 40, 331 (1966).
L. E. Strong, T. Kinney, and P. Fischer,J. Solution Chem. 8, 329 (1979).
J. G. Travers, K. G. McCurdy, D. Dolman, and L. G. Hepler,J. Solution Chem. 4 267 (1975).
A. J. Ellis,J. Chem. Soc. 2299 (1963).
A. Fischer, B. R. Mann, and J. Vaughan,J. Chem. Soc. 1093 (1961).
R. J. H. Clark and A. J. Ellis,J. Chem. Soc. 247 (1960).
A. J. Read,J. Solution Chem. 4, 53 (1957).
D. A. Lown, H. R. Thirsk, and W. F. K. Wynne-Jones,Trans. Faraday Soc. 66, 51 (1970).
A. J. Read,J. Phys. E: Sci. Instr. 6, 694 (1973).
E. J. Mickewicz,Trans. ASME,75, 325 (1953).
A. I. Vogel,Quantitative Inorganic Analysis 3rd ed. (Longmans Green and Co., London, 1961), p. 261.
J. R. Fischer and H. L. Barnes,J. Phys. Chem. 76, 90 (1972).
G. J. Bignold, A. D. Brewer, and B. Hearn,Trans. Faraday Soc. 67, 2419 (1971).
T. Shedlovsky,J. Am. Chem. Soc. 54, 1411 (1932).
F. G. Brockman and M. Kilpatrick,J. Am. Chem. Soc. 56, 1483 (1934).
Ref. 2 p. 466
R. A. Robinson and A. I. Biggs,Aust. J. Chem. 10, 128 (1957).
Steam Tables, National Engineering Laboratory. (Her Majesty's Stationery Office, Edinburgh, 1964).
R. Hilbert, Ph.D. Dissertation, Universität Karlsruhe, West Germany.
T. Grindley and J. E. Lind,J. Chem. Phys. 54, 3983 (1971).
H. S. Harned and B. B. Owen,The Physical Chemistry of Electrolytic Solutions, 3rd ed. (Reinhold Publishing Corp., New York 1958), p. 648.
D. A. Lown, H. R. Thirsk, and W. F. K. Wynne-Jones,Trans. Faraday Soc. 64, 2073 (1968).
T. Matsui, H. C. Ko, and L. G. Hepler,Can. J. Chem. 52, 2912 (1974).
T. Ackermann and F. Schreiner,Zeit. Electrochem. 62, 1143 (1958).
H. Hoiland,J. Chem. Soc. Faraday Trans. I 70, 1180 (1974).
F. J. Millero,Chem. Rev. 71, 147 (1971).
M. Sakurai,Bull. Chem. Soc. Japan 46, 1596 (1973).
C. Ostiguy, J. C. Ahluwalia, G. Perron, and J. E. Desnoyers,Can. J. Chem. 55, 3368 (1977).
T. M. Seward,Geochim. Cosmochim. Acta 40, 1329 (1976).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Read, A.J. Ionization constants of benzoic acid from 25 to 250°C and to 2000 bar. J Solution Chem 10, 437–450 (1981). https://doi.org/10.1007/BF00652078
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00652078