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Unformatted text preview: Page 1 of 5 Name Qz Section Points assigned to tables, graphs questions, and calculations. EXPERIMENT 6: ATOMIC EMISSION SPECTROSCOPY(AES) Part I. Measuring the Hydrogen Emission Spectrum Part II. An Application of AES; Determination of Sodium Part I. Measuring the Hydrogen Emission Spectrum 4 DATA Table 1. Hydrogen Emission Data Color Wavelength, nm violet 430 656.20 3954.59 bluegreen 480 486.92 3969.48 red 660 434.05 2315.79 410.13 472.12 397.20 91.00 A: Data Analysis 2 0.2500 656.2 0.00152393 3 0.1111 486.9 0.00205373 4 0.0625 434.1 0.00230388 1 5 0.0400 410.1 0.00243825 6 0.0278 397.2 0.00251762 2 Slope: R from slope: No yintercept: R from yintercept: 0.0026 3 Spectroscope Data Ocean Optics Spectrometer λ (nm), descending order Intensity of peak at each wavelength Table 2. Hypothesis #1; n f = 1; n i = 2, 3, 4, 5, 6 n i values 1/n i 2 λ (nm) 1/ λ nm1 nm1 Is n f =1? nm1 Hypothesis #1 : n f (assumed) = 1; therefore n i = 2, 3, 4, 5, 6. If the hypothesis is correct, a plot of 1/ λ 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/ λ 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. Total points: 60 (This template = 56 pts, Notebook = 4) 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/ λ 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". 5. From the Rydberg equation, you know that the slope is equal to R and the yintercept is equal to R/n f 2 . Calculate R both ways and compare (5 Sig figs should be plenty.) Use these in the data analysis. Data here will autofill into the third column of Tables 24 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: Note: I added lines to all of my graphs. It was too problematic to delete them. They should represent sole data points....
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This note was uploaded on 07/08/2008 for the course CHEM 162 taught by Professor N. during the Spring '08 term at University of Washington.
 Spring '08
 N.
 Atom, pH

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