By I M Kolthoff
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Trav. lab. Carlsberg, 11, 265 (1916). Tague: J. Am. Chem. , 42, 173 (1920). Calculated by author. Holmberg: Z. physik. , 70, 157 (1910). Wood: J. Chem. , 93, 411 (1908). , 36, 1625 (1903). , 86, 3325 (1903); 37, 153, 2289 (1904). Th. Paul: Arch. , 889f 48 (1901). Michaelis and Davidsohn: Biochem. , 47, 250 (1912). A. Bork: Z. physik. , 189, 58 (1927). S. Andrews and C. L. A. Schmidt: J. Biol. , 73, 651 (1927). For more recent literature, cf. Landolt-Bornstein-Koth, Physikalisch-Chemische Tabellen, Vol.
1, 165 (1927); Chemical Abstracts, 21, 2210 (1927). 02 ill |wgls3w| ijjljli g a a a'i^ ? 9 OOOO O O " OOOOOOOOOO 00 00 00 1C 00 ^O iO id iO fcC o o o o o XXXXX O
A~ the If we let A denote the amino acid 2 RCOOH, shall see later NH A+ hybrid ion, the older view the cation, and A~ the anion, then according to CH+XA-: = K a, [A] (i) [A+JOH-] _ According to the modern concept, we have to deal with the following equilibria: +NH RCOOH 3 <= +NH RCOO- + H+ A+<=*+Aand 3 + H+, NH RCOO- + H O <^ +NH RCOO- + OR-, A- + H +* +A- + OH-. 2 2 2 3 ACID-BASE INDICATOKS 44 The equilibrium constants are and - -- [+A-JOH-] K ' and Kb are a and basic dissociation constants and Kb are merely the apparent dis- the true acidic of the ampholyte whereas sociation constants.
Acid-base indicators by I M Kolthoff