Monoprotic Acid—Base Diagrams

  • William B. Guenther


In this chapter we introduce a variety of graphical displays of monoprotic acid—base equilibria. Although a number of diagrammatic methods for solving pH problems has been proposed, none is as fast as numerical approximation using equations (3-2)−(3-5), for those who are experienced in chemistry. For the student, however, these diagrams can help develop the experience needed to make correct approximations suitable under various conditions. First, we present a complete ratio diagram since it is the simplest to use and the most foolproof to interpret. The log α and log C diagrams shown next are either more complicated (log α) or less foolproof, requiring estimations as to the approximate equalities or intersections to look for (log C).


Ionic Strength Material Balance System Point Equilibrium Ratio Pure Acid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Selected Reading

  1. Sillen, L. G., “Graphic Presentation of Equilibrium Data,” in Treatise on Analytical Chemistry, ed. by I. M. Kolthoff and P. J. Elving, Interscience, New York, 1959, Part I, Vol. 1, Chapter 8. (Reprinted in paperback as Chemical Equilibrium in Analytical Chemistry.)Google Scholar
  2. Freiser, H., and Q. Fernando, “Teaching Ionic Equilibrium: Use of Log-Chart Transparencies,” J. Chem. Ed. 42, 35–38 (1965).CrossRefGoogle Scholar
  3. Langford, C. H., BASIC Equilibrium Calculations, Addison-Wesley, Reading, Massachusetts, 1973.Google Scholar

Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • William B. Guenther
    • 1
  1. 1.Department of ChemistryThe University of the SouthSewaneeUSA

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