AQA GCSE Chemistry - Electrolysis of Aqueous Solutions 4.4.3.4

Ions Discharged

Occurs when an aqueous solution is electrolysed using inert electrodes. Dependent on the relative reactivity of the elements involved.

At Negative Electrode

Hydrogen produced if the metal is more reactive than the hygrodgen.

At Positive Electrode

Oxygen is produced unless solution contains halide ions when halogen is produced.

Halide Ions at Positive Electrode

Only occurs when aqueous solution water molecules break down producing discharged hydrogen and hydroxide ions.