# Chemistry

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Hard water contains Ca ,Mg ,Fe and , 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 1100. of hard water contains 0.021 M of Ca and 0.0060 M of Mg , how many moles of Na are needed to replace these ions?

If the sodium is added to the water softener in the form of , how many grams of sodium chloride are needed?

• Chemistry -

1100 WHAT of hard water?
If the sodium is .........in the form of WHAT, how many........needed?

• Chemistry -

Hard water contains Ca ,Mg ,Fe and , 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 1100. L of hard water contains 0.021 M of Ca and 0.0060 M of Mg , how many moles of Na are needed to replace these ions?

If the sodium is added to the water softener in the form of , how many grams of sodium chloride are needed?

• Chemistry -

How many moles Ca and Mg do you have? That will be M x L = 1100 x 0.021 = ? moles Ca and
1100 x 0.0060 = ?moles Mg.
Total moles Ca+Mg = the sum.

Since the valence of Ca and Mg is two and that of Na is one, it will take twice as many moles of Na as you have for the sum of Mg + Ca.
You didn't answer the second part of my first response but I assume you meant how many grams of NaCl are needed.
So you have total moles Na needed, so moles = grams/molar mass. Substitute moles Na and molar mass NaCl to find grams NaCl.

• Chemistry -

If 1500. of hard water contains 0.019 and 0.0070 , how many moles of are needed to replace these ions?
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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