Equivalent weight is the measure of how much of a substance is needed to react with or replace one unit of another substance. It helps figure out the amount of a substance that takes part in a chemical reaction. To find equivalent weight, use this simple formula:
Equivalent Weight = Atomic Weight / Valency
Example: Sodium (Na) has an atomic weight of 23 and a valency of 1. So, its equivalent weight is 23 / 1 = 23. It means 23 grams of sodium can combine with or replace 1 gram equivalent of another substance in a chemical reaction.
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