lab 6 - Page 1 of 5 Name Qz Section Points assigned to...

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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 blue-green 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 y-intercept: R from y-intercept: 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 nm-1 nm-1 Is n f =1? nm-1 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 y-intercepts 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 y-int. 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 y-axis and 1/n i 2 on the x-axis. 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 R-squared on chart". 5. From the Rydberg equation, you know that the slope is equal to -R and the y-intercept 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 2-4 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.

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lab 6 - Page 1 of 5 Name Qz Section Points assigned to...

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