1) One way to help identify the components of a product mixture with gas chromat

Question

1) One way to help identify the components of a product mixture with gas chromatography is to?

A) Run the sample through both polar and nonpolar columns

B) Run the samples through the GC at different temperatures

C) Increase the size of the sample run through the GC

D) Spike the sample with a small amount of a possible component

2 Which error is most likely to have caused the following scenario: the solvent does not flow evenly up the slide and teh results is a distorted chromatogram with overlapping spots and/or spots off the side of the plate.

A) when placing spots the applicator dislodged some of the adsorbent

B) the spots are placed too close together

C) an incorrect developing solvent was used

D) the plate was developed at the incorrect temp.

3) Of the different drugs tested in the experiment, which should have the greatest Rf value with a nonpolar developing solvent and why?

A)Ibruprofen because although it has a carboxylic acid functional group this is only a small part of the entire structure which is nonpolar in nature.

B) Salicylamide because its not as polar as aspirin

C) Caffeine because all polar groups are evenly distributed around the central structure

D) Acetaminophen because the amine and the alcohol groups found on the structure have very little polarity

***These questions are for a lab assignment so if you are unsure please do not answer, thank you****

Explanation / Answer

1. D

2. A

3. A

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