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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
Best Answer: In both instances, the substance is boiling. However, in distillation you are interested in collecting (or removing) the lower boiling substances. With reflux, the condensor is set up to return the condensed distillate to the flask. Hence, it boils perpetually and in principle never loses any liquid.In practice, there is always a slow loss.owever, in distillation you are interested in collecting (or removing) the lower boiling substances. With reflux, the condensor is set up to return the condensed distillate to the flask. Hence, it boils perpetually and in principle never loses any liquid. In practice, there is always a slow loss.