Question

Give the significance of the normal hydrogen electrode.

Answer 1

1. Reference standard: The NHE is used as the universal reference electrode, with its electrode potential defined as 0.00 V. All other electrode potentials are measured relative to it.
2. Electrochemical series: It forms the basis of the electrochemical series, helping to determine which elements are better oxidising or reducing agents.
3. Calculation of cell potential: By coupling any half-cell with the NHE, we can calculate the standard electrode potential (E°) of that half-cell.
4. Redox behaviour: It helps in predicting the feasibility of redox reactions by comparing electrode potentials.