Required Practical: Electrolysis of Aqueous Solutions (AQA GCSE Chemistry Combined Science): Flashcards

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Required Practical: Electrolysis of Aqueous Solutions
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Ions produced when water dissociates in electrolysis

H+H^+ and OH−OH^- ions

Rule for which ion is reduced at cathode

Less reactive ion is reduced

Rule for which ion is oxidised at anode

Ion that can be oxidised more easily

Ion reduced at cathode in CuSO4CuSO_4 solution

Cu2+Cu^{2+} (copper is less reactive than hydrogen)

Product at cathode in CuSO4CuSO_4 electrolysis

Solid copper deposits

Ion oxidised at anode in CuSO4CuSO_4 solution

OH−OH^- (no halide ions present)

Products at anode in CuSO4CuSO_4 electrolysis

Oxygen gas and water

Ion reduced at cathode in NaCl solution

H+H^+ (sodium is more reactive than hydrogen)

Product at cathode in NaCl electrolysis

Hydrogen gas

Ion oxidised at anode in NaCl solution

Cl−Cl^- (chloride ions are halide ions)

Product at anode in NaCl electrolysis

Chlorine gas

When are halide ions oxidised at anode?

Usually oxidised if present

When are OH−OH^- ions oxidised at anode?

When no halide ions present, producing oxygen gas

What happens to reactive cations like Na+Na^+ at cathode?

H+H^+ ions are reduced instead

Explore AQA GCSE Chemistry Combined Science Revision Notes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

Explore AQA GCSE Chemistry Combined Science Quizzes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore AQA GCSE Chemistry Combined Science Exam Questions by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

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