In cation-exchange resins, what ion replaces Ca²⁺ and Mg²⁺ in the hard water that is passed over the resin? A) Ba²⁺ B) K⁺ C) Li⁺ D) Na⁺ E) H⁺

Question

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Cation-exchange resins contain negatively charged functional groups that attract positively charged ions such as Ca2+ and Mg2+ in hard water. These ions are then replaced by other cations that are present on the resin, with Na+ being a common choice. Therefore, the ion that replaces Ca2+ and Mg2+ in the hard water is Na+. Choice D is the option that represents Na+.

In Cation-Exchange Resins, What Ion Replaces Ca2+ and Mg2+ in the Hard

In Cation-Exchange Resins, What Ion Replaces Ca²⁺ and Mg²⁺ in the Hard