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Ions in water

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Hi there. I am unsure of how to do this question. It's question 4.102 in Chemistry: The Central Science 11E.

Hard water contains Ca 2+, Mg 2+, and Fe 2+, 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 Mg 2+, how many moles of Na + are needed to replace these ions?

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The 2-page solution shows how to calculate the number of moles of sodium required to replace the other ions in the water.

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