The question I have to answer is:

If two peaks of gas chromatogram are too close, what changes in experimental conditions (factors affecting separation) could you make to separate them more effectively?

Answer:

I thought the answer would be the length of the column. If you change the length of the column longer, it will be able to take longer for the compounds to separate.

I was wondering, if there any other factors?

3 answers

explain why two beakers may not have the same weight
A longer column could work but it may not be practical. Other ideas are to change the column, itself, change the flow rate of the gas, change the temperature.
To nathalia.
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