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单词 gram equivalent
释义

gram equivalent


gram equivalent

n. The amount of a substance whose weight in grams is numerically equal to its equivalent weight.

gram equivalent

or

gram-equivalent weight

n (Chemistry) an amount of a substance equal to its equivalent weight expressed in grams

equiv′alent weight′


n. the combining power, esp. 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. [1925–30]

Gram Equivalent


Gram Equivalent

 

the number of grams of a chemical element or compound equal to the weight of its chemical equivalent. The gram equivalent of a chemical element is numerically equal to the quotient resulting from dividing the element’s atomic weight by its valence. For example, the gram equivalent of iron (atomic weight 55.847) with a valence of 2 is 27.92 g and with a valence of 3, 18.62 g. The gram equivalent of acid is that amount of the acid in grams containing one gram equivalent of hydrogen capable of being displaced by metal with the formation of salt. The gram equivalent of a base is that amount of the base in grams that is necessary for its complete reaction with one gram equivalent of acid. The gram equivalent of salt is that amount of the salt in grams containing one gram equivalent of metal. The concept of gram equivalent is widely used in volumetric analysis.

gram equivalent


gram e·quiv·a·lent

1. the weight in grams of an element that combines with or replaces 1 g of hydrogen; 2. the atomic or molecular weight in grams of an atom or group of atoms involved in a chemical reaction divided by the number of electrons donated, taken up, or shared by the atom or group of atoms in the course of that reaction; 3. the weight of a substance contained in 1 L of 1 n solution; a variant of (1). Synonym(s): combining weight, equivalent weight, equivalent (5)

gram e·qui·va·lent

(gram ĕ-kwiv'ă-lĕnt) 1. The weight in grams of an element that combines with or replaces 1 gram of hydrogen. 2. The atomic or molecular weight in grams of an atom or group of atoms involved in a chemical reaction divided by the number of electrons donated, taken up, or shared by the atom or group of atoms in the course of that reaction. 3. The weight of a substance contained in 1 liter of normal solution; a variant of (1).
Synonym(s): equivalent (5) .

gram equivalent

In chemistry, an outdated term for the mass in grams of a substance that will react with 1 g of hydrogen.
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更新时间:2025/1/31 2:02:07