(SP%2710%20235)%20Quiz%204

(SP%2710%20235)%20Quiz%204 - In reality, most distillations...

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Chemistry 235 Due the week of Feb. 8-12, 2010 Organic I George A. O’Doherty Quiz #4 Name There is a total of 10 points for this quiz. Answer all questions in the space provided. [I] (5 points) An ideal distillation of a solution of benzene (b.p. 80 °C), toluene (b.p. 110 °C) and o -xylene (b.p. 143 °C) should occur with discreet increases of temperature. (That is to say the first fraction should come over at 80 °C followed by an immediate rise in temperature to 110°C a second fraction should come over then a third and immediate rise in temperature should occur to 143 °C at which point the last fraction should distil.
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Unformatted text preview: In reality, most distillations go through gradual rises in temperature to the desired distillation temperature were a mixture of compound comes over until it reaches the desired temperature (at which point relatively pure fractions are collected). Why is the rise between distillation points gradual and not immediate? [II] (5 points) For each set of two compounds circle the compound that you think would come off the column more slowly (i.e. have the longer retention time ). 1) octane hexane 2) ethanol methanol 3) butane ethanol 4 ) benzene methane 5) benzene toluene...
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