# Dilute sulfuric acid is electrolysed using inert electrodes. Explain what happens at each electrode during this electrolysis, including the type of reaction occurring and the product formed at each electrode.

> Pearson Edexcel International GCSE Chemistry (4CH1) — 1.9 Electrolysis · Explain · 4 marks

> Dilute sulfuric acid contains hydrogen ions (H⁺) and sulfate ions (SO₄²⁻) as well as water molecules. Inert electrodes are used so that the electrode material does not affect the reactions.

## Mark scheme (4 marks)

1. At the cathode (negative electrode), hydrogen ions gain electrons / are reduced
2. Hydrogen gas is produced at the cathode
3. At the anode (positive electrode), hydroxide ions / water molecules lose electrons / are oxidised
4. Oxygen gas is produced at the anode

## Key terms

- [inert electrode](https://www.gradenine.co.uk/glossary/inert-electrode)
- [electrolysis](https://www.gradenine.co.uk/glossary/electrolysis)

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