assumed to involve the transfer of a proton (H⁺) from an acid to a base.

Hydronium ions are acids according to all three definitions. Although alcohols and amines can be Brønsted-Lowry acids, they can also function as Lewis bases due to the lone pairs of electrons on their oxygen and nitrogen atoms.

Arrhenius acids

In 1884, Svante Arrhenius attributed the properties of acidity to hydrogen cations (H⁺), later described

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