Potentiometric Titrations:

The potential of a suitable indicator electrode is conveniently employed to establish the equivalence point for a titration (a potentiometric titration). A potentiometric titration provides different information from a direct potentiometric measurement rather than involving absolute potentials or potentials with respect to standard half- cells, the measurements are made while the titration is in progress. The equal point of the reaction will be revealed through a sudden modification in potential within the plot of emf readings against the volume of the titrating solution. One electrode must be maintained at a constant, other than not essential known, potential; the other, electrode must serve as an indicator of the changes in ionic concentration and must respond rapidly. The solution must, of course, be stirred during the titration.