hw #5 - hydrocarbons which is not CF 4 A2 The best detector...

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Tien Wei (Tom) Lee SID: 21846711 Chem 15 Lab Lab Section 101 GSI: Jamie Kulp Chem 15: Homework Set #5 22-1. Three extractions with 100 mL would be more effective. 22-7. 22-8. 22-17. The larger the partition coefficient, the larger the c s value. This means the solute spends a longer time attracted to the stationary phase than to the mobile phase. In essence, the solute is stuck immobile more than it is moving. Therefore, the larger the partition coefficient, the longer it takes to be eluted. 22-18. a) k = time solute spends in stationary phase/ time solute spends in mobile phase b) time solute spends in mobile phase = time solute spends in stationary phase/ k c)
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22-22. -Problem A: A1. The Photoionization Detector should be useful for determining how much CF 4 is present in the atmosphere because it is good at measuring volatile organic compounds and other gases. On the other hand, Flame ionization detector responds best to
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Unformatted text preview: hydrocarbons, which is not CF 4 . A2. The best detector to couple with a gas chromatography would be the electron capture detector. Since the Photoionization Detector has a detection limit from 25 pg to 50 pg, electron capture can make up for the range below 25 pg for it can go as low as 5 fg/ s. 23-6. The thermal conductivity detector does not detect the carrier gas because it uses the gas as the reference. The flame ionization detector’s signal is proportional to the number of susceptible carbon atoms, and only about 1 in 100,000 carbon atoms produce an ion. 23-10. 23-11. Problem B: The K value for SE-30 should be very small for the stationary phase has little attraction to the solute. The K value for Carbowax 20M should be very big for the stationary phase will attract the solute a lot....
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This note was uploaded on 02/11/2012 for the course CHEMISTRY 15 taught by Professor Bordel during the Fall '11 term at Berkeley.

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hw #5 - hydrocarbons which is not CF 4 A2 The best detector...

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