chemlab6 - Name: Christina Hong #0862620 Part I. Part II....

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Page 1 of 5 Name: Christina Hong #0862620 Qz Section: AF 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 5 DATA Table 1. Hydrogen Emission Data Color Wavelength, nm violet 430 nm 657.6 blue-green 480 nm 486.8 red 660 nm 434.5 410.3 397.2 A: Data Analysis 2 0.25000 657.6 0.00152 3 0.11111 486.8 0.00205 4 0.06250 434.5 0.00230 1 5 0.04000 410.3 0.00244 6 0.02778 397.2 0.00252 2 Slope: -0.00441 R from slope: 0.00441 No y-intercept: 0.00260 R from y-intercept: 0.00260 3 Spectroscope Data Ocean Optics Spectrometer λ (nm), descending order 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 (5 notebook, 55 template) 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". Right click on the equation, choose "format data labels" or "format trendline label" and change the number properties so that 5 sig figs are displayed. (Failure to do this on each plot will cost you a point!) 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. Report your results to 4 or 5 sig figs. Use these in the data analysis. Data here will autofill into the third column of Tables 2-4 Put your plot of 1/ λ vs 1/n i 2 here. Plotting Graph By signing below, you certify that you have not falsified data, that you have not plagiarized any part of this lab report, and that all calculations and responses other than the reporting of raw data are your own independent work. Failure to sign this declaration will cost you 5 points. Signature:
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This note was uploaded on 04/13/2010 for the course CHEM 152 taught by Professor Chiu during the Winter '08 term at University of Washington.

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chemlab6 - Name: Christina Hong #0862620 Part I. Part II....

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