Stearn, Allen E. (1927) Amphoteric behavior of complex systems. IV. Note on the isoelectric point and ionization constants of sulfanilic acid. Journal of General Physiology, 10 (3). pp. 379-383. ISSN 0022-1295. http://resolver.caltech.edu/CaltechAUTHORS:STEjgp27a
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From the solubility minimum the value of the basic ionization constant of sulfanilic acid is shown to lie probably between the values 1.7 x 10^–15 and 3.2 x 10^–15. From solubility measurements the value of this same constant is shown to lie probably between 2.0 and 2.2 x 10^–15, and the isoelectric point of sulfanilic acid is thus at a cH of 0.056 or a pH of 1.25. From conductivity ratios the acid ionization constant of sulfanilic acid is shown to be 7.05 x 10^–4 at room temperature (21°C.). Calculations are made, from data published in preceding papers, of the ionization constants of glycine, Ka being 2.3 x 10^–10, and Kb being 2.2 x 10^–12.
|Additional Information:||Copyright © 1927 by The Rockefeller University Press. RUP grants the public the non-exclusive right to copy, distribute, or display the Work under a Creative Commons Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/ and http://creativecommons.org/licenses/by-nc-sa/3.0/legalcode. Accepted on July 26, 1926. Contributions from the Gates Chemical Laboratory, California Institute of Technology, No. 118.|
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