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equivalent weight
the amount of substance that combines with or displaces 8.0 g of oxygen (or 1.008 g of hydrogen), usually expressed in grams;
for acid/base reactions, one equivalent donates or receives a mole of protons and the equivalent weight is the ratio of the
molecular weight to the number of protons involved in the reaction. For oxidation-reduction reactions, one equivalent donates
or receives a mole of electrons and the equivalent weight is the ratio of the molecular weight to the number of electrons
involved in the reaction.
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