1. Why is it impossible for greater than 96% pure ethanol to beobtained from fractional distillation of the fermentationmixture?
2. In terms of the velocity of light, what is refractiveindex?
3. Does your graph of the simpleand fractional distillations show any difference in the shapes ofthe two curves? What does this difference, if any; indicate aboutthe efficiency of fractional distillation relative to that ofsimple distillation for separating the ethanol/water azeotrope fromwater?
4. A compound has a refractiveindex of 1.3191 at 20.0oC. Calculate its refractive index thatwould be expected at 25.0oC.
