Acid-base titration curves for acids with very small ratios of successive dissociation constants.
The shapes of the potentiometric acid-base titration curves obtained in the neutralizations of polyfunctional acids or bases for which each successive dissociation constant is smaller than the following one are examined. In the region 0 < < 1 (where is the fraction of the equivalent volume of reagent that has been added) the slope of the titration curve decreases as the number j of acidic or basic sites increases. The difference between the pH-values at = 0.75 and = 0.25 has (1 j)log 9 as the lower limit of its maximum value.
Campbell
B H
BH
Department of Chemistry, Clarkson College of Technology, Potsdam, N.Y. 13676, U.S.A.
Meites
L
L