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what causes you not get all starting material back when you complete simple distillation and fractional...

what causes you not get all starting material back when you complete simple distillation and fractional distillation

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Solution :-

In the simple and fractional distillation when the mixture of the starting material is heated to convert the liquid into the vapors then some of the vapors lost in the evaporation process.

Also some of the vapor condense back into the distillation flask and remain their and do not removed completely by the distillation process. These two factors causes to loss some of the starting material and therefore all of the starting material is not obtained back.

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