Hard water contains Ca2+, Mg2+, and Fe2+, which interfere
with t...

Question

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?

Accepted Answer

Hey everyone. So here we have magnesium displacing aluminum, an aluminum oxide, magnesium oxide. And if magnesium is added to a solution of 0.5 L of aluminum oxide in the form of magnesium nitrate. Whereas to calculate the mass of magnesium nitrate That is needed to displace $0.45 of aluminum ions. Recall that polarity equals malls of the salute, divided by leaders of the solution. So we need to first calculate the moles of aluminum ions Were given 0.5 l And we have a 0. malls of aluminum ions and one leader. And this will give us 0.22 five moles of aluminum ions. Now we need to compare it from moles of aluminum ions to malls of magnesium ions to malls magnesium nitrate to find a mask of magnesium nitrate, 0.225 malls of A. L. Three plus And we have two moles of a. plus in the reaction. In three moles of MG two plus And for one mold of MG two plus I have one more of magnesium nitrate because I have one magnesium and magnesium nitrate. And in one ball magnesium nitrate you have the molar mass And this is 24 . plus two. I'm 14 .007 plus six. I'm 15 . Which is 148 0.3. And it's gonna give us 50 grams of magnesium nitrate. Thanks for watching my video and I hope it was helpful

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