Study Set Content:
the electromotive force of the reference electrode
Ereference
the electromotive force of indicator electrode
Eindicator
the electromotive force at the junction of the liquid
Ejunction
The main theory involved in the potentiometry is, when the known potential electrode immersed in the sample solution then the potential is given by
Nernst Equation:
Nernst Equation:
These are mainly used to measure the voltages.
ELECTRODES
Mainly two electrodes are used in the potentiometry:
1. Reference Electrode
2. Indicator Electrode
Used for the determination of the analyte by maintaining the fixed potential
1. REFERENCE ELECTRODE
Ex. of REFERENCE ELECTRODE
Standard Hydrogen Electrode, Silver – Silver Chloride Electrode, Saturated calomel Electrode
They are further classified into two main classes:
1. Primary Standard Electrodes
2. Secondary standard electrodes
▪ Ex. of Primary Standard Electrodes
Standard hydrogen Electrode
ex. of Secondary standard electrodes
Silver-silver chloride electrode, Saturated calomel electrode
