Question

What is an active electrode? Explain with the help of an example

Answer 1

Active electrode:

• An active electrode is an electrode that is defined as the metal which is used to make electrochemical cells.
• Active electrodes can be oxidized/reduced easily in comparison to other electrodes.
• The active electrode is called ‘active’ as it actively participates in the chemical reaction.
• They are used in electroplating.

Example:

• Using Copper Sulphate$\left({\mathrm{CuSO}}_4\right)$ solution as electrolyte and copper electrodes.
• Copper is electroplated on the negative electrode.
• The $\mathrm{Cu}$ in the solution is replenished due to the addition of copper ions$\left({\mathrm{Cu}}^{2+}\right)$ from the positive electrode.