Electrolysis of Aqueous Solutions (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards

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

Water dissociates into H+H^+ and OH−OH^- ions

Ions produced when water dissociates

H+H^+ and OH−OH^- ions

Which ion reduced at cathode (general rule)

Less reactive ion

Which ion oxidised at anode (general rule)

Ion that can be oxidised more easily

Ion reduced at cathode in CuSO4CuSO_4 solution

Cu2+Cu^{2+} ions

Why Cu2+Cu^{2+} reduced not H+H^+ in CuSO4CuSO_4

Cu is less reactive than hydrogen

Product deposited at cathode in CuSO4CuSO_4 electrolysis

Solid copper

Ion oxidised at anode in CuSO4CuSO_4 solution

OH−OH^- ions

Why OH−OH^- oxidised in CuSO4CuSO_4 not SO42−SO_4^{2-}

OH−OH^- more easily oxidised (no halides present)

Products at anode in CuSO4CuSO_4 electrolysis

Oxygen gas and water

What's reduced if cation very reactive (e.g. Na+Na^+)

H+H^+ ions from water instead

What's oxidised at anode if halide ions present

Halide ions

Cathode equation for CuSO4CuSO_4 electrolysis

Cu2++2e−→CuCu^{2+} + 2e^- \rightarrow Cu

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

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Electrolysis

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Reactivity of Metals

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Electrolysis

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