Electrolysis of Aqueous Solutions (AQA GCSE Chemistry): Flashcards

Water produces $H^+$ and $OH^-$ ions that can react

$H^+$ and $OH^-$ ions

Compound ions AND $H^+$/$OH^-$ from water

Less reactive ion is reduced

Ion oxidised more easily is oxidised

Less reactive

Solid copper deposits

$Cu^{2+}(aq) + 2e^- \to Cu(s)$

When no halide ions present

Oxygen gas and water

$4OH^-(aq) \to 2H_2O(l) + O_2(g) + 4e^-$

$H^+$ ions reduced instead

Halide ions (e.g., $Cl^-$)