Abstract
The molal dissociation quotients of D-galacturonic acid were measured potentiometrically in a newly-designed, hydrogen-electrode concentration cell from 5 to 100°C at four ionic strengths ranging from 0.1 to 1.0 mol-kg−1 using sodium trifluoromethanesulfonate (NaF3CSO3) as the supporting electrolyte. These quotients were fitted in the all anionic (isocoulombic) form by an empirical equation incorporating three adjustable parameters. When combined with the known dissociation quotient for water in the same medium, this treatment yielded the following thermodynamic quantities for the acid dissociation equilibrium at 25°C and infinite dilution: log KH=−3.490±0.011, ΔH 0 H =0.4±0.2 kJ-mol−1, ΔS 0 H =−65±1 J-mol−1-K−1, and ΔC 0 p, H =−231±8 J-mol−1-K−1. Comparisons are made with the corresponding results of a limited number of previous studies carried out near ambient conditions.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
F. A. Loewus and S. Kelly,Arch. Biochem. Biophys. 95, 483 (1961).
F. Ehrlich and F. Schubert,Ber. Deutsche Chem. Gesell. B 26, 2026 (1974).
G. Kessler, E. F. Neufeld, D. S. Feingold, W. Z. Hassid,J. Biol. Chem., 236, 308 (1961).
J. Riov,Plant Physiol. 55, 602 (1975).
V. F. Rasper, “Chemical and Physical Characteristics of Dietary Cereal Fiber” in “Dietary Fibers: Chemistry and Nutrition,” G.E. Ingled and S.I. Falkehag, eds., (Acad. Press, New York, 1979) p. 93.
J. F. Thibault, “Les Proprietes physico-chimiques des Fibres” in “Les Fibres Alimentaires”, X. Rouau and J. F. Thibault, eds. (APRIA, Paris, 1987) p. 191.
P. D. Hoaghland and P. E. Pfeffer,J. Agric. Food Chem. 35, 316 (1987).
S. M. Bagheri and L. Gueguen,Reprod. Nutr. Develop. 25, 705 (1985).
W. T. Lindsay,Proc. Int. Water Conf. Eng. Soc. W. Pa. 41, 284 (1980).
R. E. Mesmer, D. A. Palmer, and J. M. Simonson,Ion Association at High Temperatures and Pressures, inActivity Coefficients in Electrolyte Solutions, 2nd Edn. K. S. Pitzer, ed., (CRC Press, Boca Raton, 1991) Chp. 8.
D. A. Palmer and S. E. Drummond,J. Phys. Chem. 92, 153 (1988)
T. H. Giordano and S. E. Drummond,Geochim. Cosmochim. Acta 55, 2401 (1991).
D. A. Palmer and K. E. Hyde,Geochim. Cosmochim. Acta 57, 1393 (1993).
P. Karrer and G. Schwarzenbach,Helvetica Chim. Acta 17, 58 (1934).
R. Speiser, C. F. Hills, and C.R. Eddy,J. Phys. Chem. 49, 328 (1945).
R. E. Mesmer, C. F. Baes, Jr., and F. H. Sweeton,J. Phys. Chem. 74, 1937 (1970).
C. F. Baes, Jr., and R. E. Mesmer,The Hydrolysis of Cations (Wiley, New York, 1976).
A. S. Quist and W. L. Marshall,J. Phys. Chem. 69, 2984 (1965).
P. C. Ho and D. A. Palmer, submitted for publication.
R. A. Robinson and R. H. Stokes,Electrolyte Solutions, Butterworths, 1959.
D. A. Palmer and S. E. Drummond,J. Solution Chem.,17, 153 (1988).
W. R. Busing and H. A. Levy, Oak Ridge Natl. Lab. Rep., ORNL-TM (U.S.) ORNL-TM-271 (1963).
K. S. Pitzer,J. Phys. Chem. 77, 268 (1973).
C. Liu and W. T. Lindsay,J. Solution Chem. 1, 45 (1972).
J. L. S. Bell, D. J. Wesolowski and D. A. Palmer,J. Solution Chem. 22, 125 (1993).
R. E. Mesmer, C. S. Patterson, R. H. Busey and H. F. Holmes,J. Phys. Chem. 93, 7483 (1989).
R. H. Busey and R. E. Mesmer,J. Chem. Eng. Data,23, 175 (1978).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Narkhede, M.R., Nguyen-Trung, C. & Palmer, D.A. Dissociation quotients of D-galacturonic acid in aqueous solution at 0.1 MPa to 1 molal ionic strength and 100°C. J Solution Chem 23, 877–888 (1994). https://doi.org/10.1007/BF00972751
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00972751