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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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