MidtermExam2010

MidtermExam2010 - Midterm Exam S343 Summer 2010 Name:_ 1....

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Midterm Exam S343 Summer 2010 Name:__________________________________________ 1. _____/5 2. _____/5 3. _____/5 4. _____/5 5. _____/5 6. _____/5 7. _____/5 8. _____/5 9. _____/5 10. _____/5 11. _____/5 12. -15 ______/10 16._____/10 17._____/10 18. _____/15
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Questions 1-7 refer to this information: A student performed a reaction in organic laboratory that was designed to make about 3 grams of this diol. He was able to do a crude workup and purification to get a sample that was mainly his product with a minor impurity of the starting alkene. 1. (5pts) Would an extraction using ether and water be an effective means of purifying this product? Explain. 2. (5pts) Would an extraction using ether and aqueous base be an effective means of purifying this product? Explain. 3. (5pts) The student also considered using distillation to purify the compound. What information would he need to determine if this would be a good choice for purification?
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4. (5pts) The student finally settled on purification of the compound via recrystallization. He initially considered using hexanes as a recrystallization solvent. Do you think this is a good or bad choice of solvent? Explain. 5. (5pts) After recrystallization, he recovered over a gram of sample, which was a little lower than he hoped for. What are two problems that could lead to low recovery of product, and how could he improve his recovered yield in the future? 6.
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This note was uploaded on 01/18/2012 for the course CHEM S343 taught by Professor Benburlingham during the Summer '11 term at Indiana.

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MidtermExam2010 - Midterm Exam S343 Summer 2010 Name:_ 1....

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