http://www.mhhe.com/physci/chemistry/essentioalchemistry/flash/molvie.swf
Why is the freezing point lowered when salt is added to water?
When salt (NaCl) dissolves in water, its sodium (Na+) and chlorine (Cl-) ions leave the salt crystals and mix separately among the water molecules. These ions affect the water molecules and their freezing temperatures.
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