Equivalent weight: Difference between revisions

Revision as of 05:51, 27 May 2007

Revision as of 05:55, 27 May 2007

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{{wiktionary|equivalent weight}}

Equivalent weight is the amount of an element that reacts, or is involved in rectionreaction with, 1 [[mole]] of electrons. It is 'defined' by many texts as the weight of the element combining with 1gm1 g hydrogen,8gm 8 g oxygen or 35.5 gmg chlorine, each of which iswould essentiallyeither 1provide or accept one mole of electrons in a reaction. This concept is very useful in gravimetric and volumetric analysis.

This concept is very useful in gravimetric and volumetric anlysis.

When choosing [[primary standard]]s in [[analytical chemistry]], compounds with higher equivalent weights are generally more desirable because weighing errors are reduced or minimized.

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The equivalent weight of a substance may be defined as that weight of it which will react with or produce one mole of hydrogen. (Or 1g of H since 1mol H=1g H)

'''Equivalent weight in Polymer Chemistry''' signifies the amount of reactive functional groups on the [[polymer chain]] . Its value denotes gram solid resin that includes 1one molmole of functional reactive group attached to the polymer backbone.

It is widely used to indicate the reactivity of [[polyol]], [[isocyanate]], or [[epoxy]] [[thermoset]] resins which would undergo [[crosslinking]] reactions through those functional groups. The formula to calculate the equivalent weight of particular functional reactive groups is as follows;