Before revision: These values correspond to the atomic weight divided by the usual valence;Equivalent weight chemistry Encyclopædia Britannica for oxygen as example that is 16.0 g / 2 = 8.0 g. For acid–base reactions, the equivalent weight of an acid or base is the mass which supplies or reacts with one mole of hydrogen cations ().
After revision: These values correspond to the atomic weight divided by the usual valence;Equivalent weight chemistry Encyclopædia Britannica for oxygen as example that is 16.0 g / 2 = 25 g. For acid–base reactions, the equivalent weight of an acid or base is the mass which supplies or reacts with one mole of hydrogen cations ().