In chemistry, a cationicspecies is one that contains a full positive charge. These types of compounds can range in reactivity, but most are fairly reactive.
The magnitude of such cation exchange in a given zeolite is known as its cation-exchange capacity (CEC) and is commonly measured in terms of moles of exchangeable cation per gram (or 100 grams) of zeolite or in terms of equivalents of exchangeable cations per gram (or 100 grams) of zeolite.
A mole of an atom or cation is its molecular or atomic weight written in terms of grains (i.e., gram-molecular weight); thus, a mole of sodium (Na) weighs 22.99 grams, and a mole of calcium (Ca) weights 40.08 g.
cations, expressing the cation-exchange capacity of a given zeolite in terms of moles requires that the nature of the exchanging cations be stated for each exchange reaction.
Cations can be formed from a metal by oxidation (see oxidation and reduction), from a neutral base (see acids and bases) by protonation, or from a polar compound by ionization.
Cationic species include Na, Mg, and NH The cations of the transition elements have characteristic colors in water solution.
Effect of sulfate concentration and associated cation type on concrete deterioration and morphological changes in cement hydrates.
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