Posted by Jessie on Wednesday, October 7, 2009 at 12:07pm.
No, it could not be used. You have to have molecules of solute dispersed uniformly over the surface of the solution to achieve freezing point depression. If the material does not dissolve, you would have a colloidal mixture. Patches of ice would form at the normal freezing point.
It depends on what you mean. If you mean a solution not water based, for instance an organic dissolved in an organic substance, neither of which is soluble in water, the answer is yes, freezing point depression is a colligative property associated with vapor pressure reduction. See http://en.wikipedia.org/wiki/Raoult%27s_law
However, if you are thinking of a non water soluble substance added to water, drwls is correct, it wont work.
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