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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
The process of cation exchange involves penetration of water via resin bead material known as exchange resins. Water ions are typically replaced with other ions that are fixed to these beads. This could result either in deionization or softening of water.