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1. Maths
a. having a particular property in common; equal
b. (of two equations or inequalities) having the same set of solutions
c. (of two sets) having the same cardinal number
2. Maths Logic (of two propositions) having an equivalence between them



The equivalent of an element is the weight, expressed in carbon mass units, that will combine with or replace one atomic weight of hydrogen or one-half atomic weight of oxygen.

The equivalent of an acid is equal to the acid’s molecular weight divided by its alkalinity (number of hydrogen ions).

The equivalent of a base is equal to the base’s molecular weight divided by its acidity (number of hydroxyl groups).

The equivalent of a salt is equal to the molecular weight of the salt divided by the sum of the charges of the cations or anions forming the salt.

In oxidation-reduction reactions, the equivalent of an oxidizing agent is equal to the quotient obtained as a result of dividing the agent’s molecular weight by the number of electrons obtained by the atom or atoms of the reduced element. The equivalent may vary, depending on the number of electrons accepted by the oxidizing agent.

The concept of equivalent is widely used in the stoichiometric calculations of chemical reactions.


References in periodicals archive ?
The high functionality/low equivalent weight RD is used as part of the donor.
In such cases, constructing a robust factor and an equivalent weight matrix directly from such data is unreasonable.
Subsequently, the equivalent weight matrix is computed (Equations (13) and (14));
The compositional variables utilized for the were: (1) QAS moiety concentration, (2) hydride-to-vinyl ratio for crosslinking, and (3) hydride equivalent weight of the PMHS-PDMS starting polymer.
A contingency analysis was performed in order to understand the effect of PHMS-PDMS hydride equivalent weight of the starting copolymer on coating film uniformity/integrity.
The polymer equivalent weight was measured with FT-IR (37).
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