Question

How can we separate sugar and salt mixture?

Answer 1

If it is a dry mixture, then you can use 100 percent 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 the solution. Addition of an excess of acetone to the solution should precipitate the salt, which can be filtered off. Evaporation of acetone will yield the sugar. An alternative is to mix vigorously with toluene, which will dissolve the sugar but not salt, and separate the layers using a separating funnel (as the toluene does not mix with water).

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