Freezing Alcohol and Water
Name: Sue C.
I know that when ice begins to freeze (at 0 degrees C)dissolved
ions move out so the ice is purer than the water that forms it, yet,
I understand that alcohols are not forced out, and
alcohol will prevent the water from freezing. How is this possible?
Freely soluble alcohols form hydrogen bonds with the water. Thus, they are
difficult to completely exclude from the ice lattice. Their presence
interferes with the structure of the lattice and thereby affects (depresses)
the water's freezing point.
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Update: June 2012