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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
There is a bit of overlap (so it is never pure), but generally we can seperate the ethanol from the water and other impurities present. The more alcohol in the liquid, the more alcohol will be in the vapour, so multiple distillations allow us to increase the strength & purity right up to 96.5%. The concept of distillation is really quite simple.