chemistry Group
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drjjpdc Teacher
Middle SchooleNotes Editor
Posted by drjjpdc on Saturday June 13, 2009 at 6:50 PMThis is a very easy answer. Sugar is soluble in alcohols while salt is not. Simply mix the two in alcohol and filter the solution to get the salt. Then evaporate the alcohol sugar mixture and you will be left with the sugar. Done.
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cambtone Teacher
College - SenioreNotes Editor
Posted by cambtone on Monday June 15, 2009 at 12:05 PMIf it is a dry mixture, then you can use 100% alcohol which will dissolve the sugar, but not the salt (which can be filtered off). The alcohol has to be evaporated to yield the sugar.
If they are mixed in water, then you could try reducing the volume by boiling, but not too long in case one or other comes out of solution. Addition of an excess of acetone to the solution shouldl precipitate the salt, which can be filtered off. Evaporation of the acetone will yield the sugar. An alternative is to mix vigorously with toluene, which will dissolve the sugar but not the salt, and separate the layers using a separating funnel (as the toluene does not mix with water).
