Lab6_Atomic_Emission_Spectra

Lab6_Atomic_Emission_Spectra - Name: Kevin Stock 0760631...

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Page 1 of 6 Name: Kevin Stock 0760631 QZ Section: BV 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 435 657.0 blue-green 485 486.6 red 660 434.7 410.6 388.7 A: Data Analysis 2 0.2500000 656.98 0.00152212 3 0.1111111 486.61 0.00205503 4 0.0625000 434.67 0.00230060 1 5 0.0400000 410.61 0.00243540 6 0.0277778 388.65 0.00257301 2 Slope: 0 R from slope: 0 y-intercept: 0 R from y-intercept: 0 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? No 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) 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.) 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: Put your plot of 1/ λ vs 1/n i 2 here. Plotting Graph Highlight y-axis values (numbers only) -> \Insert -> Chart\ -> XY(scatter)->Sub-chart with no lines-> Next\- >Series(top of active windows)->click on X values window-> Go to original data table and highlight all x- axis data ->next\->Complete chart title and label the x and y axis -> Next\ ->Finish Add a linear trendline by right-clicking on any data point. You will want to display the equation and R-squared

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This note was uploaded on 07/07/2011 for the course CHEM 152 taught by Professor Chiu during the Spring '08 term at University of Washington.

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Lab6_Atomic_Emission_Spectra - Name: Kevin Stock 0760631...

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