Chemistry – Electrochemistry - Electrolysis | e-Consult

When the electrolysis of aqueous copper(II) sulfate is carried out using inert carbon electrodes, the following observations are made:

• Anode (Positive Electrode): Small, brown crystals of sulfur are observed forming on the surface of the carbon electrode. These crystals gradually accumulate over time.
• Cathode (Negative Electrode): Bubbles of gas are evolved from the surface of the carbon electrode. This gas is collected and tested with a damp splint, which will demonstrate the production of hydrogen gas (a loud pop).
• Solution:** The aqueous copper(II) sulfate solution remains clear and colorless. The concentration of copper(II) ions in the solution decreases as they are consumed at the anode.
• Overall:** The process is slow compared to using copper electrodes.