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Unformatted text preview: Page 1 of 10 EXPERIMENT 6: ATOMIC EMISSION SPECTROSCOPY(AES) Points assigned to tables, graphs Part I. Measuring the Hydrogen Emission Spectrum questions, and calculations. Part II. An Application of AES; Determination of Sodium Part I. Measuring the Hydrogen Emission Spectrum DATA 2 Table 1. Hydrogen Emission Data Color Wavelength, nm violet 425 656.7 2 bluegreen 480 486.5 red 660 434.3 410.1 397.4 Spectroscope Data Ocean Optics Spectrometer (nm), descending order This template = 60 pts Use these in the data analysis By signing below, you certify that you have not falsified data and that you have not plagiarized any part of this lab report. Failure to sign this declaration will cost you 5 points. Signature: Data here will autofill into the third column of Tables 24 350 400 450 500 550 600 650 700 500 1000 1500 2000 2500 3000 3500 4000 4500 Intensity vs. Wavelength Column B Wavelenth (nm) Intensity Page 2 of 10 A: Data Analysis 2 0.2500 656.7 0.001523 3 0.1111 486.5 0.002055 4 0.0625 434.3 0.002302 1 5 0.0400 410.1 0.002438 6 0.0278 397.4 0.002516 2 Slope:0.0043975 R from slope: 0.0043975 No yintercept: 0.0025990 R from yintercept: 0.0025990 3 3 0.1111 656.7 0.001523 4 0.0625 486.5 0.002055 5 0.0400 434.3 0.002302 1 6 0.0278 410.1 0.002438 7 0.0204 397.4 0.002516 2 Slope:0.010962 R from slope: 0.010962 Yes yintercept: 0.002741 R from yintercept: 0.010963 3 Table 2. Hypothesis #1; n f = 1; n i = 2, 3, 4, 5, 6 n i values 1/n i 2 (nm) 1/ nm1 nm1 Is n f =1? nm1 Table 3. Hypothesis #2; n f = 2; n i = 3, 4, 5, 6, 7 n i values 1/n i 2 (nm) 1/ nm1 nm1 Is n f =2? nm1 Hypothesis #1 : n f (assumed) = 1; therefore n i = 2, 3, 4, 5, 6. If the hypothesis is correct, a plot of 1/ vs. 1/n i 2 should be linear (good R 2 ) and the Rydberg constants calculated from slope and the yintercepts should be the same. Calculate 1/ and 1/n i 2 , then plot the data and include the equation and R 2 on the plot. Compare the R values calculated from the slope and yint. Excel Help for Data in Tables 2, 3 & 4 1 . Column B: =1/(Click on column A entry)^2, Enter. Copy and paste into remaining cells. 2. Column D: =1/(Click on Column C entry), Enter. Copy and paste into other cells. 3. Format cells to desired number of decimal places. Highlight cells, Format, Number, select number of decimal places. A number that does not fit the column width will show an error and a number that is too small for the formatting will register as zero. You also have the option to write the number in scientific notation. 4 .Plot 1/ on the yaxis and 1/n i 2 on the xaxis. Right click on any data point and add a trendline. In the trendline help box, choose linear type, and under the options tab, click on the boxes in front of "display equation on chart" and "display Rsquared on chart"....
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This note was uploaded on 04/07/2008 for the course CHEM 152 taught by Professor Chiu during the Spring '08 term at University of Washington.
 Spring '08
 Chiu
 Chemistry, Atom, pH

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