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Unformatted text preview: 5. In recrystallization, why is it important to cool the solution slowly? D a) in order to trap out all the impurities b) in order to achieve the biggest crystals c) in order to form a seed crystal d) in order to keep all of the impurities in solution, rather than in the crystals 6. A student performs an extraction in a separatory funnel. Compound A is extracted with 200 mL of ether two times from 250 mL of water. If there are 4.25 g total grams of compound A, how much of compound A will remain in the water layer after the two extractions? (Assuming Kp = 4.3) A a) .22 g b) 1.2 g c) .97 g d) 3.98 g 7. After the two extractions, the student evaporates the solvent from compound A. What is the percent recovery? C a) 5% b) 27% c) 95% d) 73% 8) The addition of an ionic substance such as NaCl is often used during an extraction to prevent: C a) salting out b) precipitations c) emulsions d) separation...
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- Spring '08
- Solvent, 5%, 3 m, 27%, 22 g, Ether organic layer