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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
Name the cation. 1  Metals that form only one cation. 2  As noted in Section 2.1 Chemical Compounds , these metals are usually in groups 1â3, 12, and 13. 3  The name of the cation of a metal that forms only one cation is the same as the name of the metal (with the word ion added if the cation is by itself).