This experiment is one of several \"techniques\" experiments that are completed

Question

This experiment is one of several "techniques" experiments that are completed in the first semester of the Organic Laboratory Course. Name: _______ Section: ________ Date: _______ Choice of recrystallization solvent ______ amount of acetanilide used, grams _________ amount of pure acetanilide obtained, grams __________ acetanilide recovery, % ________ melting range of impure acetanilide, degree C ____ melting range of purified acetanilide, degree C _________ Post-Laboratory Questions: On a separate sheet (preferably typed) complete the post laboratory questions in your laboratory manual. Show all calculations! Additional Post-Laboratory Questions: 1. What technique is being investigated in this experiment? 2. When will this technique be useful? 3. What evidence do you have that the purified acetanilide is pure then the acetanilide? Consider appearance, melting temperature and melting range. 4. Why is i. expected to the recovery for this experiment would be less than 100%?

Explanation / Answer

1. Recrystallization technique is investigated in the experiment.

2. When the substance to be purified is a solid then the technique is useful.

3. The melting point matching experiment with pure sample gives purity of recrystallized sample

4. The mixture has some insoluble impurities as well and hence the expeirment should yields less than 100% yield.

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