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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+. 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+ are needed to replace these ions?