Wednesday

October 22, 2014

October 22, 2014

Posted by **Mikal** on Wednesday, March 19, 2008 at 1:34am.

1. In gas chromatography, two measurements are made. Identify the qualitative and quantitaive measurements.

dye color and retention time

2. Why are components such as polymers like starch and cellulose unsuited to identification using GC?

long chains of insoluble substances

3. In a mixture of the alcohols ethanol C2H5OH, propanol, C3H7OH and butanol C4H9OH, which would you expect to emerge first from the Gc column. Give reasons for your answer.

ethanol because it has the smallest molecular mass out of the three

- Chem -
**Dr Russ**, Wednesday, March 19, 2008 at 9:39am1. In gas chromatography, two measurements are made. Identify the qualitative and quantitaive measurements.

dye color No The question is about GAS chromatogrpahy so it is a property of a gas you would want. However I don't think the question is asking for this. it is being more general, what measurement do you use to get the quantitative result?

and retention time Yes, but this is not the quantitative measurement.

2. Why are components such as polymers like starch and cellulose unsuited to identification using GC?

long chains YES - OK

of insoluble substances. You need to explain why being 'insoluble' is relevant here.

3. In a mixture of the alcohols ethanol C2H5OH, propanol, C3H7OH and butanol C4H9OH, which would you expect to emerge first from the Gc column. Give reasons for your answer.

ethanol because it has the smallest molecular mass out of the three. Yes agreed, now look at your answer to (2).

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