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pH titration of weak acid with overlapping pKa values

I am trying to determine the calculations for determining the experimentatl pKa from measured pH values, known acid conc and known base conc. I am only able to determine calculations for two overlapping dissociations but not three - it is a similar case to citric acid titrated with NaOH.

Jen Witherspoon
Student - Columbia, Missouri, USA
2005

See E. J. King, "Acid-Base Equilibria", MacMillan, 1965, Chapter 9.

EJ Behrman
- Columbus, Ohio, USA
2005

Here's another reference: A. Kraft, Journal of Chemical Education, 80, (2003), 554-559.

EJ Behrman
- Columbus, Ohio
2005

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