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In common usage, the term hydrogen ion is used to refer to the hydrogen ion present in water solutions, in which it exists as the combined molecule H + ·H 2 O.. The formula H + ·H 2 O is also commonly written as H 3 O + and denotes the hydronium or oxonium ion. The amount of hydrogen ion present in a water solution is used as a measure of the acidity of a substance; the higher the H&I Action Sundays at 11AM | 10C— Superman, Batman, Wonder Woman and more!