PreLab Questions: Dehydration
Please type and submit the answers to the following questions:
1. The 100 mL reaction flask for this reaction should be clean but does not have to be
dry before starting. Why?
2. What apparatus is employed to drive the equilibrium of this reaction towards
product formation?
3. After the distillation, the product is “purified” in a process generally referred to
as “the work-up”. Certain reagents were added to your reaction solution to remove
unwanted components. What is removed by each of the following?
a. aqueous sodium hydroxide solution
b. calcium chloride
4. What’s the difference between washing and extracting?
5. Why must you remove the stopper from the separatory funnel, before draining the
bottom layer out?
For Questions 6-9, consider the following scenario: Run a reaction
using 9 mL of cyclohexanol and 7.0 mL of 9 M sulfuric acid in order
to form cyclohexene. Show work for conversions.
6. In this experiment, sulfuric acid is not to be considered in the calculations to
determine the limiting reagent. Why?
7. Calculate the number of moles of cyclohexanol used in this scenario.
8. What would be the theoretical yield (in grams) of cyclohexene in this scenario?
9. If 4.33 g of cyclohexene was obtained from this scenario, what would be the
percent yield?