Question

Describe the principle of potentiometry along with the concept and working of reference and Indicator electrode.

Answer 1

Answer:

In potentiometric analysis, there are two electrodes, an indicator electrode (platinum here) where reduction takes place and reference electrode (calomel electrode) where oxidation takes place.

So here the reference is not ESTP cell but the Ecathode that is the calomel electrode, so there is drop to −241mV after the equivalance point. Hence, Ecell=Ecathode