Chem 152 - Lab 6 - Atomic Emission Spectroscopy

# Chem 152 - Lab 6 - Atomic Emission Spectroscopy - Name:...

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Page 1 of 6 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 450 657.32 4003.43 blue-green 530 487.35 4003.85 red 660 435.04 4079.8 410.61 230 397.38 93 A: Data Analysis 2 0.2500000 657.32 0.00152133 3 0.1111111 487.35 0.00205191 4 0.0625000 435.04 0.00229864 1 5 0.0400000 410.61 0.00243540 6 0.0277778 397.38 0.00251648 2 Slope: 0 R from slope: 0 no y-intercept: 0 R from y-intercept: 0 3 Name: Alice Meng-Ju Hsieh Qz Section: AP 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: 0.0000000 0.1000000 0.2000000 0.3000000 0.00000000 0.00050000 0.00100000 0.00150000 0.00200000 0.00250000 0.00300000 f(x) = 0x + 0 R² = 0.99 1/lamda VS. 1/ni^2 Column D Linear Regression for Column D 1/ni^2 1/lamda (nm^-1)

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Page 2 of 6 3 0.111111111 657.32 0.00152133 4 0.062500000 487.35 0.00205191 5 0.040000000 435.04 0.00229864 1 6 0.027777778 410.61
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## This note was uploaded on 10/27/2010 for the course CHEM 152 taught by Professor Chiu during the Spring '08 term at University of Washington.

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Chem 152 - Lab 6 - Atomic Emission Spectroscopy - Name:...

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