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Drinking Water From Salt

Posted by on Jul. 4, 2012 at 5:15 PM
  • 9 Replies
1 mom liked this
I don't know about where you are, but it's been hotter than Billy Blue Blazes here. (though, now I'm curious about who Billy Blue is and who set him on fire....lol). One of the ways we try to bear the heat is through doing experiments. They can be fun, cheap, easy and educational!

Drinking water is becoming more and more scarce the world over as fresh water supplies are evaporated due to global warming and droughts. You can use the following resources to do some research on the current water shortage situation:

http://drinkingwaterz.com/2369-shortage-of-drinking-water.html
http://whyfiles.org/131fresh_water/2.html

One of the things that has intrigued scientists from the time we emerged from the caves, was how to take the plentiful salt water of the seas and oceans and make them palatable for drinking.

Ok, onto the experiment, this is a small scale version of one of the methods scientists are evaluating.

Supplies:
* 1-2 TBS table salt
* bowl
* 3 cups water (tap water is fine)
* small bowl or coffee cup
* stone
* thick plastic wrap

Procedure:
1) pour watere into the larger bowl
2) mix salt into the water until it is dissolved
3) place the small bowl or cup into the water CAREFULLY, you do not want to let any of the water to flow ov the sides of the cup.
4) Place the stone in the center of the plastic wrap, so at the wrap angles down into the cup a bit.
5) carefully place the bowl in the sun
6) wait several hours. You should see water droplets on the inside of the plastic wrap dripping into the cup.
7) after a few hours allow student to taste the water in the cup - it won't be salty!

What happened:

The water from The bowl evaporated, condensing on the underside of the plastic wrap (which is why heavy duty plastic wrap is so important, lesser quality plastic wrap will allow the water vapor to escape and leave the cup empty.) salt doesn't evaporate, so essentially the evaporation process separates the water molecules from the salt ones.

 Home Educators Toolbox  / Articles / Kicbuttmama's Crazy Lapbooks / Kickbuttmama's Home Education
Albert Einstein -- 
   "Everybody is a Genius. But if you judge a fish by its ability to climb a tree, it will spend its whole life believing it is stupid." 

by on Jul. 4, 2012 at 5:15 PM
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Replies (1-9):
Lo1427
by on Jul. 4, 2012 at 5:24 PM
This sort of reminds me of a dual survival episode. They were on an island and had to make drinking water.
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KickButtMama
by Shannon on Jul. 4, 2012 at 6:20 PM
Quoting Lo1427:

This sort of reminds me of a dual survival episode. They were on an island and had to make drinking water.



Lol, yeah, you could use this in many instances..lol..

 Home Educators Toolbox  / Articles / Kicbuttmama's Crazy Lapbooks / Kickbuttmama's Home Education
Albert Einstein -- 
   "Everybody is a Genius. But if you judge a fish by its ability to climb a tree, it will spend its whole life believing it is stupid." 

Boobah
by Nikki :) on Jul. 4, 2012 at 6:47 PM
That is awesome! And good to know, too!
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rsrangel
by Bronze Member on Jul. 4, 2012 at 6:49 PM
Awesome! We live right by the ocean, so we'll grab some salt water and give it a try!
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Boobah
by Nikki :) on Jul. 4, 2012 at 7:01 PM
Jealous! ;)

Quoting rsrangel:

Awesome! We live right by the ocean, so we'll grab some salt water and give it a try!
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KickButtMama
by Shannon on Jul. 4, 2012 at 7:55 PM
Quoting rsrangel:

Awesome! We live right by the ocean, so we'll grab some salt water and give it a try!



You could also do an experiment varying the amount of salt to see how that could impact the results, since some seas have higher salt content than the oncean. The possibilities are endless!!

 Home Educators Toolbox  / Articles / Kicbuttmama's Crazy Lapbooks / Kickbuttmama's Home Education
Albert Einstein -- 
   "Everybody is a Genius. But if you judge a fish by its ability to climb a tree, it will spend its whole life believing it is stupid." 

usmom3
by BJ on Jul. 4, 2012 at 10:50 PM

 COOL

mem82
by Platinum Member on Jul. 5, 2012 at 10:57 AM

Neat!

kirbymom
by Sonja on Jul. 5, 2012 at 1:07 PM

 Me Too!!  : )

Quoting Boobah:

Jealous! ;)

Quoting rsrangel:

Awesome! We live right by the ocean, so we'll grab some salt water and give it a try!

 

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