A source of error in the determination of equivalence volumes of carboxylic acids from potentiometric titrations.
Emf measurements on mixtures of carboxylic acids, HA, and the corresponding bases, A, containing a high and constant salt background, show that the equation E = E(0) + glnh + j(h)h commonly used in the calculation of equivalence volumes is not strictly followed. Terms linear in [HA] and [A] should be added. The origin of these terms is discussed briefly and their influence on the accuracy of equivalence-volume determinations is evaluated.
Olin
A
A
Department of Analytical Chemistry, University of Uppsala, P.O.B. 531, S-751 21 Uppsala, Sweden.
Wallén
B
B