Potentiometric measurements:

In contrast to direct potentiometric measurements, potentiometric titrations generally offer increased accuracy and precision. Accuracy is rise because; measured potentials are used to detect rapid changes in activity that occurs at equivalence point of the titration. In addition, it is a change in emf versus titre volume rather than absolute value of emf. Therefore, the influence of liquid-junction potentials and activity coefficients is minimized.

Potentiometric titrations might be applied to a variety of systems including those including oxidation-reduction, acid-base, precipitation, and complexation equilibria reactions. We will elaborate all these systems in detail in subsequent sections.

Further, potentiometric end-point detection also provides more accurate result than the corresponding method employing indicators. It is mainly meaningful for titration of coloured or opaque solutions and for detecting the presence of unsuspected species in a solution. Titrations of more dilute solutions are probable using potentiometry.

Unfortunately, it is more consume time than a titration performed with an indicator. As ordinarily the titration includes measuring and recording a cell potential after each addition of a reagent.