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This is the ion formed by the dissociation of an acid in water; it is also known as a hydronium or hydroxonium ion. Its formula is H3O+

According to the Bronsted-Lowry definition of acids and bases, a species acts as an acid when it donates protons (hydrogen ions, H+) to something else. Acids in solution donate a proton to water to form the oxonium ion, H3O+. It is this ion which acts as the proton donor when an acid in solution reacts with a base.

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