As the Director of the Public Works Department for the City of International Fal

Question

As the Director of the Public Works Department for the City of International Falls, MN, you find yourself bracing for another blizzard this June. With your road salt supplies dangerously low, you decide to spread all of the CaCl2 that you have hoping to prevent the roads from freezing, counting on this to be the last blizzard of the season. If you only have enough CaCl2 to bring the concentration of salt & water to 11%, what is the coldest the temperature can be without freezing the water to ice?

Explanation / Answer

1-40 degree .

It means that water at -21 degre celsius can still remain liquid if enough salt is added.Instead of keeping liquid water from freezing ,this powerful property of salt can also be used to turn ice back into water..Sprinkling salt on the sideways lowers the freezing point of the ice below the ambient temperature and the ice melts.Inorder for water to freeze it needs something to freeze onto to start the process and it is called nucleation centres.But if the water is very pure and still and there is nothing for the water molecules to crystallize onto,you can cool very pure water well below 0 degree without its freezing and this condition is called supercooled .pure water can be supercooled to as low as -40 degree celsius.

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