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CCE09072010_00004

CCE09072010_00004 - Roshan Shah Gen Chem 2 Lab 3 March 2010...

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Unformatted text preview: Roshan Shah Gen Chem 2 Lab 3 March 2010 Lab #2 Discussion Questions 1. An explanation is that the concentration of the solution is too high. At high concentrations, not all of the sample may dissolve. Those leftover particles in the solid difl'ract light away from the getector, resulting in the absorbance being higher than the “true” value. Consequenfly, a non-linear region in a Beer’s law plot appears. ‘ (- 2) - 5 Lick Oxflgutwt-«fiai WJU 2 2. A reason for the absorbance found in the non-linear range could be because the concentration is too high. At high concentrations, there could m absorb light at different wavelengths. We can dilute the solution becausemcfiu‘afion is too high to produce an absorbence lying in the linear range of the plot. Find the concentration on the line in the plot and dil it. 3. A. Weusedoceanoptics, whichhadanerror of.01. This is because the _ spectrophotometer reads up to 2 decimal places, and a result, the error is .01; 5]”) ;. “'2 (- C 3) B. If we had one measurement, then the standard error of Ocean Optics would be the more accurate method. But if we had multiple measurements, then our actual error determined from the standard deviations would be more accurate. It depends on the situation, but in this lab the standard deviations you: accurate. This is because we did multiple trials, and human error decreases. 41L; - L16 Q 4. A. The relative error for the measuring pipet is .05 mL. The filative error for the micropipette is 1 uL. The relative error for the spectrophotometer is .0(gfl .05/4.5 * 100 = 1.1%. 1/500 * 100 = 2%. .01/.55 * 100 = 1.82%. I used sample 6 for the‘ magnitude of measurement for the spectrometer and micropipette. B. The spectrometer will have the greatest influence on error in the unknown’s concentration as determined by the standard curve because it has the highest relative error. I calculated the relative error for all the glassware used in the lab, and the error for 1 the spectrometer, and the highest value gives the one that has the greatest influence on the ‘ error. In this case, it happenedto/bethe spectrometer. 1 ...
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