Electrolysis of Aqueous Solutions (AQA GCSE Chemistry): Quizzes

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Electrolysis of Aqueous Solutions
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Why is electrolysis of aqueous solutions more complex than molten ionic compounds?

Water can also undergo electrolysis

What ions does water produce when it partially dissociates?

H+H^+ and OHOH^- ions

During aqueous electrolysis, which ions can react at the electrodes?

Ions from compound and H+H^+/OHOH^-

At the cathode, which ion will be reduced?

The less reactive ion

At the anode, which ion will be oxidised?

The ion oxidised more easily

In CuSO4CuSO_4 solution, which ions are present at the cathode?

Cu2+Cu^{2+} and H+H^+ ions

Why are Cu2+Cu^{2+} ions reduced at the cathode instead of H+H^+ ions?

Copper is less reactive than hydrogen

What is produced at the cathode during electrolysis of CuSO4CuSO_4 solution?

Solid copper deposits on cathode

In CuSO4CuSO_4 solution, which ions are present at the anode?

SO42SO_4^{2-} and OHOH^- ions

What is produced at the anode during electrolysis of CuSO4CuSO_4 solution?

Oxygen gas and water

What happens when reactive cations like Na+Na^+ are present at the cathode?

H+H^+ ions are reduced instead

What happens at the anode if halide ions like ClCl^- are present?

Halide ions are usually oxidised

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