CH-1821
Electrolysis of solutions
Chemistry · Secondary 4 · Medium · Electrolysis of solutions
Aqueous copper(II) sulfate is electrolysed using inert carbon electrodes. After some time, the blue colour of the solution becomes paler. Which change best explains this observation?
- Cu²⁺ ions are discharged and deposited as copper metal on the cathode.
- SO₄²⁻ ions are discharged and form sulfur dioxide gas at the anode.
- Water is discharged at the cathode to form hydrogen, leaving more Cu²⁺ ions.
- Cu²⁺ ions are produced at the anode, increasing the blue colour.
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