Potentiometric titration is a technique similar to direct titration of a redox reaction. No indicator is used, instead the voltage across the analyte, typically an electrolyte solution is measured. To do this, two electrodes are used, a neutral electrode and a standard reference electrode. The voltage is recorded at intervals as the titrant is added. A graph of voltage against volume added can be drawn and the end point of the reaction is half way between the jump in voltage.
EMF of the cell depends on the concentration of the electrolytes with which the electrodes are in contact. Therefore, the electrode reaction is Mn++ne------>M As the concentration of Mn+ changes,the emf of the cell also changes correspondingly Thus the potentiometric titration involve measurement of emf between indicator electrode and reference electrode,with the addition of titrant. types of potentiometric titration: acid-base titration (total alkalinity and total acidity), redox titration (HI/HY and cerate), precipitation titration (halides), and complexometric titration (free EDTA and Antical #5).