By I M Kolthoff
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Extra info for Acid-base indicators
P. stands for the hydrogen ion concentration at the isoIn equation (11) is given a simple relationship electric point. p. and the various constants involved. (Cf. also H. ECKWEILLER, H. M. NOTES, and K. G. FALK; 2 P. A. LEVENE and H. S. SIMMS 3 for methods of determining the isoelectric point, see L. MICHAELIS/ S. P. L. ), and W. R. ATKIN. 4 ) ; If the substance contains m acid groups and n basic groups, then according to Levene and Simms: " -\ l 3 Kai \ 1 2 ed. Julius Springer, L. Michaelis: Die Wasserstoffionenkonzentration.
CHAPTER THREE THE ION ACTIVITY THEORY AND ITS APPLICATION TO ACID-BASE EQUILIBRIA 1. Historical review. Classification of electrolytes. of GROTTHUS concerning the elecconductivity of solutions proposed that the positive and negative parts of the electrolyte molecules were transferred from As early as 4805 the theory trical molecule to molecule by a chain mechanism. portions must have an independent existence Consequently these for at least a short time during the electrolysis. These dynamic considerations led R.
Influence. Such mixtures which are resistant to a change in reaction were called Buffer Mixtures by S. P. L. SoRENSEN. 1 L. HICHAELIS* coined the term Regulators. They may also be referred to as Ampholytes because of the amphoteric character of such mixtures. 1 S. 2 L. (1914). All mixtures of weak adds and their salts, P. L, Sdrensen: Compt. rend. trav. lab. Carlsberg, 8, 1 (1909). Michaelia; Die Wasserstoffionenkonzentration, Berlin, Julius Springer ACID-BASE INDICATORS 24 or of weak bases with their salts, are therefore buffer mixtures (or regulators, or ampholytes).