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when the boiling point difference is less than 20 degrees; limited to larger samples in fractional distillation why are we using a GC in this experiment to determine the composition of the fractions I obtained from simple distillation
Distillation is a method of separating or purifying liquids based on their different boiling points. If you don't wish to construct the distillation apparatus and can afford it, you can buy a complete setup. That can get expensive, so here is an example of how to set up a distillation apparatus from standard chemistry equipment.