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Chem152_AES_Report_080110 - Name ID Number Quiz Section Lab...

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Page 1 of 12 Name: Quiz Section: Points assigned to tables, gr ID Number: Lab Partner: questions, and calculat EXPERIMENT 6: ATOMIC EMISSION SPECTROSCOPY(AES) Part I. Measuring the Hydrogen Emission Spectrum Part II. An Application of AES; Determination of Sodium Total Points = 60 (5 notebook, 55 template) Part I. Measuring the Hydrogen Emission Spectrum DATA Table 1. Hydrogen Emission Data Spectroscope Data Ocean Optics Spectrometer Color Wavelength, nm violet blue-green red A: Data Analysis 0.0 0.0 0.0 0.0 0.0 Slope: R from slope: y-intercept: R from y-intercept: 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. 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 smal 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 "displa 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 Hypothesis #2 : n f (assumed) = 2; therefore n i = 3, 4, 5, 6, 7. 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. Put your plot of 1/ λ vs 1/n i 2 here. Make your plot big enough to cover this instruction box so that it is large enought for someone else to read.
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