Chem 654_Lab 2 Dimethylbutanediol Reaction Pre-Lab Questions

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University of New Hampshire *

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654

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Chemistry

Date

Feb 20, 2024

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pdf

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1

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Chem 654: Lab 2 Reaction of 2,3-Dimethyl-2,3-butanediol with an Acid Catalyst Pre-Lab Questions (4 points) 1. In this lab, you are asked to determine the structure of the reaction product (C 6 H 12 O). Show the calculations for the theoretical yield of the product. Put these calculations in your lab notebook. (This answer is what goes in the wt./vol. column for the product in the table of reagents.) (2 points) 2. Why is the crude distillate washed with saturated aqueous NaCl rather than with pure water? (2 points) 3. The distillation involved during the reaction stage of the procedure removes both water and your product from the reaction. This type of distillation is known as a steam distillation. Using the theory behind this technique, explain how a pure organic liquid can be distilled at a temperature that is lower than its boiling point. (3 points) 4. Describe what a positive result for each of the classification tests to be used in this experiment looks like.
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