CHEM 143A Lecture Notes - Lecture 6: Gas Chromatography, Hexane, Heptane
1 Apr 2019
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Boiling points of hexane and heptane are 69 and 98, respectively. Should be measuring the vapor temperature of hexane. Very small quantity and small but long column. Can change polarity, we should use a nonpolar column to separate nonpolar compounds week 6 page 1. Cannot use uv vis for these compounds because they have no pi electrons. Detector is not uv it looks at conductivity. Wire in the detector creates heat (like a lightbulb). Retention time changes if you change the polarity of your solvents. Got to say what you ran this with and what your conditions were. Experiment 6- running with a standard to compare. So one compound could release more heat than another. You must calculate the response factor. (in lab manual/handout) But there is a difference in the response so you have to change the scale. Ratio corresponds to volume. week 6 page 2. Going to use ir to identify the compounds.
