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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
1 By blowing air also the separation can be done with very light and heavy solid mixtures. 2  Distillation: Mixtures of liquids can be separated when their boiling points are different by this technique. 3  The mixture is slowly heated in a distillation flask.