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... bsp; N = 7. 74 Mixture CH 2 Cl 2 Chcl 3 Tr = 75 tr = 175 Wb = 115 wb = 290 N = 16 (75 / 115) 2 N = 16 (175 / 290) 2 N = 6. 81 N = 5. 83 Total N for mixture = 12. 64 Area of Peaks for Mixture: Area = . 5 (wb x ht) CH 2 Cl 2 Chcl 3 A = . 5 (30 mm) (110 mm) A = . 5 (74 mm) (82 mm) A = 1680 mm 2 A = 3034 mm 2 Composition of Mixture: Area of CH 2 Cl 2 = 1680 mm 2 Area of Chcl 3 = 3034 mm 2 1680 / 4714 100 = 35. 6 % 3034 / 4714 100 = 64. 4 % Mixture is: 35. 6 % CH 2 Cl 2 64. 4 % Chcl 3 Conclusion: The purpose of this lab was to find out how the different gases tested interacted with the surface of solid. The lab worked well for testing this. To even further test the interaction we sent of a mixture of the two gases through the column at the same time. By doing that we can compare the graphs of the single gases and of the mixture.
Below is some of the information from that. Table 1 CH 2 Cl 2 Chcl 3 Mixture CH 2 Cl 2 Mixture Chcl 3 TR 80 175 75 175 WB 115 260 115 290 N 7. 74 5. 38 6. 81 5. 83 The elution profiles of the single gases compared to that of the mixture actually match up really well. The biggest difference is the number of plates between that of the CH 2 Cl 2 by itself and the Chcl 3 of that in the mixture. The number of plates for the Chcl 3 is pretty close for both the mixture and the single gas.
The values of the retention times and base width are actually really close. The retention time for both the single gas of Chcl 3 and the mixture are exactly the same as are the base width of the CH 2 Cl 2. I would expect the measurements to be the same or close for all of these because if though one is a mixture the gases should separate and move through the column at the same rate they did the first time when they were the only mobile phase. As with any experiment, there were more than likely some systematic and random errors that occurred.
Some possible systematic errors that could have occurred would be that the flame shield and wire gauze pad did not completely block out all exterior light from entering. Therefore, the sensor could have been picking up on small amounts of extraneous light. Another systematic error could be that the coil was not wound into a tight enough coil, which would make the flame sputter and not burn as true. Some random errors, which could have taken place would be that the computer might have collected the information correctly if the sensor was malfunctioning any or if the computer was lagging. The biggest problem noticed in our lab was that it was hard to get the flame the right height because the valve on the buret would either turn to far, or not far enough.
We did end up getting the flame to the right height though. Overall this experiment was a success and achieved what it was set out to do, explain how the different gases used interacted with the surface of the powder tide.
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