What is the Difference Between Active and Inert Electrodes?

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The main difference between active and inert electrodes lies in their participation in the chemical reactions occurring within an electrochemical cell. Here are the key differences between the two:

  • Active Electrodes:
  • Actively participate in the chemical reactions occurring in the electrochemical cell.
  • Can be oxidized or reduced.
  • Commonly used in electroplating, where one metal is applied to another metal using an electrolytic solution.
  • Examples include copper electrodes.
  • Inert Electrodes:
  • Do not actively participate in the chemical reactions occurring in the electrochemical cell.
  • Serve as a conduit for electron transfer between the solution and the external circuit.
  • Used in electrolysis, where an electric current is passed through an ionic solution to produce a chemical reaction.
  • Examples include platinum and graphite electrodes.

In summary, active electrodes are involved in the chemical reactions within an electrochemical cell, while inert electrodes do not participate in these reactions but facilitate electron transfer between the solution and the external circuit.

Comparative Table: Active vs Inert Electrodes

Here is a table comparing the differences between active and inert electrodes:

Active Electrode Inert Electrode
Participates in the chemical reaction Does not participate in the chemical reaction
Can be oxidized or reduced No oxidation or reduction reactions occur
Conducts electricity through ion exchange Conducts electricity by transferring electrons with the solution, but without participating in any chemical reaction
Common active electrode materials include copper Common inert electrode materials include platinum and graphite
Used in electroplating Used in electrolysis
Electrode can lose or gain mass (e.g., anode losing mass, cathode gaining mass) Electrode does not lose or gain mass

In summary, active electrodes participate in chemical reactions and can be oxidized or reduced, while inert electrodes do not participate in chemical reactions and maintain their composition. Active electrodes are commonly used in electroplating, while inert electrodes are used in electrolysis.