Hard water contains Ca+2, Mg+2 and Fe+2, Explain which interfere with the action of soap and leave an insoluble coating on the insides of containers as well as pipes when heated. Water softeners replace these ions with Na+.
If 1500L of hard water contains 0.016M Ca+2 as well as 0.0020M Mg+2, explain how many moles of Na+2 are needed to replace these ions?