Gas Chromatography

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Neha Bhattacharjee 5/23/11 Upamanyu Basu Gas Chromatography Part 1: General Questions 1. Gas chromatography is a type of chromatography that allows for separation and analysis of a compound. It does this by vaporizing the sample then using a carrier gas to push it through a column which then separates it based on an equilibrium formed between solution and dissolution. 2. As a gaseous mixture travels down the column parts of the sample dissolve into the liquid. There is equilibrium between the gas phase (solution) and the stationary phase (liquid phase). This is what the partition coefficient is based on; it is the concentration of the sample in the stationary phase over the concentration of…show more content…
Octane: 1.25 min Nonane: 1.65 min Decane: 2.30 min Undocane: 3.60 min Dodecane: 5.50 min The smaller the alkane the faster it will reach the detector, therefore the shorter the retention time. This is because alkanes experience intermolecular Van-der-waal forces. The stronger these forces are the greater the boiling point of the alkane. The larger the alkane, the more Hydrogen bonds there are, meaning they have stronger forces (and a higher boiling point). Components with low boiling points travel faster through the column than higher boiling points, therefore the retention time of Octane is 1.25 min while the retention time of Dodecane is 5.50 min. 18. UNKNOWN B Component 1: Retention time = 5.85 min Component 2: Retention time = 1.70 min Identity of Component 1: Dodecane Identity of Component 2: Nonane There was definitely a clear correlation between the retention time of Component 2 and Nonane in the standard because there is only a .05 min difference between the retention times. However, there did not seem to be as much of a correlation between Component 1 and Dodecane because there is a difference of .35 min. 19. Component 1: Area: 9.1 cm^2 % Composition 1: 69.20 % Component 2: Area: 4.05 cm^2 % Composition 2: 30.80
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