- A redox reaction occurs when a solution of an oxidising agent is mixed with a solution of a reducing agent.
- If the solution of the oxidising agent and the solution of the reducing agent are separated by an electrolyte in a U-tube, the redox reaction will still take place but the transfer of electrons will occur through the connecting wire.
- The reducing agent undergoes oxidation with the loss of electrons. So, the carbon electrode that is immersed in the solution of the reducing agent becomes the negative cell terminal.
- Electrons flow through the connecting wire to the carbon electrode that is immersed in the oxidising agent solution. The carbon electrode acts as the positive cell terminal.
- The oxidising agent undergoes reduction with the acceptance of electrons.
Guide to Solve Problems Related to the Transfer of Electrons Through a Distance
- Oxidation always happens at anode.
- Reduction always happens at cathode.
- Anode is the negative terminal.
- Cathode is the positive terminal.