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prelab 8 - John Goodson Analysis of a Halide Mixture by Gas...

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John Goodson Analysis of a Halide Mixture by Gas Chromatography Introduction: In this experiment, sulfuric acid is used to protonate the hydroxyl group of tert-butanol. The newly formed cation (R-OH 2 + ) undergoes a dissociation reaction which results in the formation of a neutral water molecule (OH 2 ) and a tertiary carbocation (R 3 C + ). If a nucleophile (Nu) is present, the nucleophile will attack the carbocation to produce R 3 C-Nu. In the experiment, there are two nucleophiles present in large excess but equal amounts (1:1 ratio). Each nucleophile must then compete against the other in to reach the carbocation. The following is a sample image representing the type of reaction (SN1) taking place: Gas chromatography involves the distribution of the sample between the stationary liquid phase and the mobile gas phase. In the process, a liquid sample is injected into a heated injection port, instantly vaporizing the sample. It then proceeds into a column containing the stationary liquid, via a carrier gas. While the sample passes through the components partition between the
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