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

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Cation-exchange resins exchange positively charged ions (cations) in hard water with other cations, typically sodium (Na+) or potassium (K+), which do not cause hardness. Ca²⁺ and Mg²⁺ are both cations that cause hardness in water, so a cation-exchange resin would exchange them for a different cation. The best choice is Na+ because it is a common cation used in cation-exchange resins for softening water. The other choices (Li+, K+, Ba2+, H+) are either less common for this application or not positively charged.

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