Salts lower the freezing point of a solvent expressed by the formula DT =Kf*B*I
where DT is the change in freezing point compared to the pure solvent (water in this case)
Kf is a constant for the solvent
B is the molal concentration of the salt in solution (more salt = higher number)
and I is the van't Hoff factor which is the number of ions given up my each molecule of salt (NaCl = 2, CaCl2 = 3)
Do the math and to increase the DT you either need to increase your salt concentration or use a salt that gives up more ions in solution. Calcium Chloride depresses freezing point 50% further using the same amount of salt. Eventually it gets so cold that you can't economically melt ice.
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Today's Featured Article - Museum Coverage: The Stuttgart Agricultural Museum - by Cindy Ladage. While cold wind was blowing back in Illinois, in Arkansas, daffodils were in bloom, and the Magnolia trees were adorned with fragrant blossoms. Stuttgart, Arkansas was the site of this year's winter Minneapolis Moline Collector's show February 25-27, 1999. The show was held at the Oliver Museum created by Don Oliver, the pioneer of the four wheel drive tractor. Oliver along with Gale Stroh and Kenneth Bull using Minneapolis Moline tractors and parts created what has become known as
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