Which of the following is the best explanation for how a water softener works? A)When hard water passes over a resin in the softener,the Ca²⁺ and Mg²⁺ ions in the water bind to the resin in place of Na⁺ ions. B)The softener releases an acid to interact with the Ca²⁺ and Mg²⁺ ions in the hard water to neutralize them. C)When hard water passes through the softener,the Ca²⁺ and Mg²⁺ ions are removed through electrolysis. D)The softener releases K⁺ ions to counteract the Ca²⁺ and Mg²⁺ ions in the hard water. E)When hard water passes through the softener,the Ca²⁺ and Mg²⁺ ions precipitate out as Mg(OH)₂ and Ca(OH)₂.

Question

Quizplus · Accepted Answer

A water softener works through a process called ion exchange, which involves the exchange of Ca2+ and Mg2+ ions in hard water with Na+ ions on the resin in the softener. This process is described in choice A.

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