equivalent weight

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equivalent weight (plural equivalent weights)

  1. (chemistry) The atomic weight of an element or radical divided by its valence; the molecular weight of a compound divided by its combining power in a specific reaction.
    • 1888, Thomas Sterry Hunt, A New Basis for Chemistry, page 149
      In the proportion d : p :: 1 : v, as applied to any liquid or solid species, p does not represent its real equivalent weight, but the weight of the normal species which, by its condensation, gives rise to the liquid or solid.
    • 1922, Leicester F. Hamilton, Calculations of Analytical Chemistry, page 38,
      The equivalent weight of an element or compound is that weight equivalent in reactive power to one atomic weight of hydrogen.


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