A student analyzes the product of his fractional distillation and is dismayed by

Question

A student analyzes the product of his fractional distillation and is dismayed by his results.  The GC showed a nearly equal concentration of the two components he was trying to separate (the GC should show a more pure product than what he started with). Choose the statement that best describes the human error responsible for these results.

The student did not heat the sample enough. The student was eager to finish and cranked the heat. The student did not properly clean his glassware. The student did not inject his sample on the GC correctly.

A student injects a 50:50 mixture of ethylbenzene and toluene on the GC. Predict the order of elution for this mixture. Answer toluene; ethylbenzene ethylbenzene; toluene there is no way to predict the order of elution

Explanation / Answer

1)

The student did not inject his sample on the GC correctly.

2)

toluene; ethylbenzene

ethylbenzene boiling point 136.2 C

toulene 110.8C

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