CH-1717
Electrolysis of solutions
Chemistry · Secondary 4 · Hard · Electrolysis of solutions
Copper(II) sulfate solution is electrolysed using copper electrodes. Which statement about the blue colour of the solution is correct?
- It becomes colourless because Cu²⁺ ions are used up at the cathode only.
- It becomes darker because more Cu²⁺ ions are formed at the anode than used at the cathode.
- It remains the same because Cu²⁺ ions formed at the anode equal those discharged at the cathode.
- It becomes paler because water is decomposed instead of Cu²⁺ ions.
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