Solved: Hard water contains Ca2+, Mg2+, and Fe2+, which
Chapter , Problem 101AE(choose chapter or problem)
Problem 101AE
Hard water contains Ca2+, Mg2+, and Fe2+, which interfere with the action of soap and leave an insoluble coating on the insides of containers and pipes when heated. Water softeners replace these ions with Na+. Keep in mind that charge balance must be maintained, (a) If 1500 L of hard water contains 0.020 M Ca2+ and 0.0040 M Mg2+, how many moles of Na+ is needed to replace these ions? (b) If the sodium is added to the water softener in the form of NaCI, how many grams of sodium chloride are needed?
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