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A Brønsted acid is a substance that donates a proton (H+). A Brønsted base is a substance that accepts a proton. For example, in the reaction of hydrochloric acid (HCl) with water, HCl donates a proton to water, making HCl the acid and water the base.
HCl (aq) + H2O (l) → H3O+ (aq) + Cl- (aq)