# Explain what happens at each electrode when aqueous sodium chloride solution is electrolysed.

> AQA GCSE Chemistry (8462) — 4.4.3 Electrolysis · Explain · 4 marks

## Mark scheme (4 marks)

1. Chloride ions move to the positive electrode (anode)
2. Chloride ions lose electrons at the anode, producing chlorine gas
3. Sodium/hydrogen ions move to the negative electrode (cathode)
4. Hydrogen ions gain electrons at the cathode, producing hydrogen gas, because sodium is more reactive than hydrogen

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