Brønsted-Lowry acid

A proton donor.

For example:

HCl(aq) → H⁺(aq) + Cl⁻

(hydrochloric acid is a strong acid)

CH₃COOH(aq) ⇌ CH₃COO⁻(aq) + H⁺(aq)

(ethanoic acid is a weak acid)

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