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. (b) If the sodium is
added to the water softener in the form of NaCl, how many
grams of sodium chloride are needed?
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Master Stoichiometry with a bite sized video explanation from Jules Bruno