(SP%2710%20235)%20Quiz%203

(SP%2710%20235)%20Quiz%203 - distillation was preformed and...

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Chemistry 235 Due the week of Feb. 1-5, 2010 Organic I George A. O’Doherty Quiz #3 Name Answer all questions in the space provided. There is a total of 10 points for this quiz. [I] (6 points) Indicate which of the following solvent combinations would be good solvents for recrystallization and explain why or why not. a) Ethanol and Water (2 points) b) Hexane and Cyclohexane (2 points) c) Hexane and Water (2 points) [II] (4 points) To purify a solution of pyridine (b.p. 115°C) by distillation from ~5% benzene (b.p. 80°C) a
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Unformatted text preview: distillation was preformed and 5 fractions were collected and ~5 ml was left in the distillation pot. Listed below is the volume and temperature of each fraction collected. Please circle the fraction(s) that you would label(s) as pure pyridine. Fraction 1 5 ml, 80°C Fraction 2 10 ml, 95°C Fraction 3 10 ml, 110°C Fraction 4 150 ml, 115°C Fraction 5 20 ml, 115°C...
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