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CHem 353-11

CHem 353-11 - Terms and Techniques Technique 7.1 Technique...

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Unformatted text preview: Terms and Techniques Technique 7.1 Technique 13.2 and 13.3c (Figure 13.12) See technique 13.5 for a discussion on this topic. Technique 11 (11.1, 11.2, 11.5, and 11.6) Technique 12 (12.1, 12.2) Technique 3.2 See technique 11.3 for more information and technique 3.2 See sections 20.5, 16.3-16.4, 21, and 22. Post Lab Questions 1. Why are boiling points and refractive indexes used to characterize liquids? 2. Concentrated sulfuric acid is often the strong acid of choice to catalyze this type of reaction. Why would concentrated HCl not be appropriate to use for this reaction? 3. Between the two reactants, we have purposefully chosen to use excess acetic acid over excess isopentyl alcohol. Why is excess acid easier to remove from the crude product than excess alcohol? 4. How does using the silica gel beads during the reaction take advantage of Le Chatelier’s principle? 5. Write balanced equations for the two reactions that took place during the bicarbonate washings. 6. Describe and explain how each of the following experimental errors or variations might affect your results. A) You failed to dry the reaction flask after washing it with water. B) You forgot to add the sulfuric acid. C) You used half the amount of acetic acid specified in the procedure. D) You used twice the amount of acetic acid specified in the procedure. E) During the distillation, your thermometer bulb was 1 cm higher than it should have been. 7. Deduce structure, and give the IUPAC name, of the ester used to obtain the 1H NMR spectrum below. ...
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