Problem: 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+. If 1500 L of hard water contains 0.020 M Ca 2+, and 0.0040 M Mg2+, how many moles of Na+ are needed to replace these ions?

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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+. If 1500 L of hard water contains 0.020 M Ca 2+, and 0.0040 M Mg2+, how many moles of Na+ are needed to replace these ions?