Question

What is standard hydrogen electrode?

What do you understand by a standard hydrogen electrode?

Answer 1

1. It is a reference electrode used to measure the electrode potentials of other electrodes. In this, hydrogen gas at 1 atm pressure is bubbled through a solution of HCl (1 M) at 25°C (298 K).
2. A platinum foil coated with finely divided platinum black is used as the inert electrode, which provides a surface for the redox reaction.
3. The electrode potential of the Standard Hydrogen Electrode (SHE) is defined as zero volts at 298 K.