H₂O₂(aq) + Al(s) → Al³⁺(aq) + H₂O(l) (pH = 1)

oxidation/reduction under an acidic environment

[H₂O₂(aq) + 2 H⁺(aq) + 2 e^– → 2 H₂O(l)] × 3

[Al(s) → Al³⁺(aq) + 3 e^–] × 2

3 H₂O₂(aq) + 2 Al(s) + 6 H⁺(aq) → 2 Al³⁺(aq) + 6 H₂O(l)