I need help with the questions posted about this lab for a
distillation of cyclohexane and toluene.
Questions:
1. In the simple distillation experiment, can you account for
the boiling point of your product in terms of the known boiling
points of the pure components of your mixture? If so, how? If not,
why not?
2. From the plot of the boiling point versus the volume of
distillate in the simple distillation experiment, what can you
conclude about the purity of your product?
3. (a) What is the effect on the boiling point of a solution
(e.g., water) produced by a soluble nonvolatile substance (e.g.,
sodium chloride)? (b) What is the effect of an insoluble substance
such as sand or charcoal? (c) What is the temperature of the vapor
above the boiling solutions in part (a) and part (b)?
4. Why is it extremely dangerous to attempt to carry out a
distillation in a completely closed apparatus (one with no vent to
the atmosphere)?
5. Why is better separation of two liquids achieved by slow
rather than fast distillation?