equivalent weight

noun Chemistry.
the combining power, especially in grams (gram equivalent) of an element or compound, equivalent to hydrogen as a standard of 1.00797 or oxygen as a standard of 8; the atomic weight divided by the valence.

Origin:
1925–30

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World English Dictionary
equivalent weight
 
n
Also called: gram equivalent the weight of an element or compound that will combine with or displace 8 grams of oxygen or 1.007 97 grams of hydrogen

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Example sentences
For alkalinity, the formula should give the gram equivalent weight.
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