Comparison of acid and base definitions across Arrhenius, Brønsted-Lowry, and Lewis theories.
Diagram comparing acid and base definitions under Arrhenius, Brønsted-Lowry, and Lewis theories, showing H⁺ in H₂O as acid and OH⁻ in H₂O as base, with H⁺ donor, accepts H⁺, accepts e⁻ pair, and e⁻ pair donor.