Equivalent weight (or equivalent mass) is a concept in chemistry that refers to the mass of a substance that will combine with or displace one mole of hydrogen atoms or one mole of electrons in a chemical reaction. It is a useful measure for understanding stoichiometry in reactions, particularly in acid-base, redox, and precipitation reactions.
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The mass corresponding to one specified reaction equivalent. The value depends on the chemical reaction; older equivalent formulas must be interpreted together with the adopted atomic weights.