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Define cation exchange: ion exchange in which one cation (as sodium or hydrogen) is substituted for one or more other cations (as calcium andâ¦ ion exchange in which one cation (as sodium or hydrogen) is substituted for one or more other cations (as calcium and magnesium in hard water)â¦ See the full definition since 1828
Ion exchange resins are polymers with a net negative or positive charge. Typically, cation exchange resins are supplied with sodium as the counterion. Because the resin is insoluble and imobile, the countercations are relatively easily exchanged, e.g., by Ca 2+ in the case of water softening.