Chem152_AES_Report - Name Rebekah Traficante Qz Section:AB...

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Page 1 of 6 Name Rebekah Traficante Qz Section:AB 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 430 657.3 4002.12 blue-green 480 652.5 501.16 red 660 486.2 4002.92 434.7 4001.62 410.9 686.63 A: Data Analysis 2 0.250 657.3 0.00152 3 0.111 652.5 0.00153 4 0.063 486.2 0.00206 1 5 0.040 434.7 0.00230 6 0.027 410.9 0.00243 2 Slope: 0 R from slope: 0 no y-intercept: 0 R from y-intercept: 0 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 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: 0.000 0.050 0.100 0.150 0.200 0.250 0.300 0.00000 0.00050 0.00100 0.00150 0.00200 0.00250 0.00300 f(x) = 0x + 0 R² = 0.7 Finding Rydberg's R using Frequency 1 Column D Linear Regres- sion for Column D Quantum number/ state wavelength (nm^-1)
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Page 2 of 6 3 0.111 657.3 0.00152 4 0.063 652.5 0.00153 5 0.040 486.2 0.00206 1 6
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This note was uploaded on 07/09/2008 for the course CHEM 152 taught by Professor Chiu during the Spring '08 term at University of Washington.

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Chem152_AES_Report - Name Rebekah Traficante Qz Section:AB...

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