High Quality Content by WIKIPEDIA articles! The equivalent (symbol: eq or Eq), sometimes termed the molar equivalent, is a unit of amount of substance used in chemistry and the biological sciences. The equivalent is formally defined as the amount of a substance which will either: react with or supply one mole of hydrogen ions (H+) in an acid– base reaction; or react with or supply one mole of electrons in a redox reaction. The mass of one equivalent of a substance is called its equivalent weight.

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