CHEM 121 Quiz: Chem 121 - Lab 3 Sample Quiz Student Answers

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13 Dec 2012
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CHEM 121 Full Course Notes
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A technique that could be used to determine the number of dyes present in a beverage is to separate it using column chromatography (for the purposes of our experiment; qualitative). Another technique would be to use paper chromatography (analytical). Another technique, thin paper chromatography can also be used: yes, it is possible to separate individual dyes by column chromatography. If there is more than one dye present, the dyes will travel through the silica at different speeds. The one that travels through the fastest will be strongly attracted to the water. The ones that travel more slowly will be more attracted to the particles in the column. These different rates that the individual dyes travel will allow for them to be drawn out of the column at different times, making analysis of the separate dyes easier: no, dyes cannot be isolated quantitatively by column chromatography.

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