Explain why the anode of an electrolytic cell is labelled positive even though oxidation (loss of electrons) occurs there.
Answer
Because an external power source drives electrons from the positive terminal into the cathode, pulling electrons away from the anode; thus the anode is connected to the positive terminal and is at a higher electric potential, making it positive despite being the site of oxidation.
Step-by-step solution
- State that an electrolytic cell requires an external voltage source to force a non‑spontaneous reaction.
- Explain that the positive terminal of the power supply is connected to the anode, pulling electrons away from it.
- Consequently, the anode loses electrons (oxidation) and attains a higher electric potential, i.e., it is positive.
- Mention that the cathode is attached to the negative terminal, receives electrons, and is therefore negative.
Common mistake: Confusing electrode polarity in galvanic cells with that in electrolytic cells
Concept tested: Polarity of electrodes in electrolytic cells
Published · How this solution was prepared and checked
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