Better Students Ask More Questions.
How could I separate a mixture of salt and sugar?
3 Answers | add yours
If 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).
Posted by cambtone on June 15, 2009 at 4:05 AM (Answer #1)
Middle School Teacher
This 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.
Posted by drjjpdc on June 13, 2009 at 10:50 AM (Answer #2)
Related QuestionsSee all »
Join to answer this question
Join a community of thousands of dedicated teachers and students.