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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
bluegreen
red
A: Data Analysis
2
0.0
3
0.0
4
0.0
1
5
0.0
6
0.0
2
Slope:
R from slope:
yintercept:
R from yintercept:
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 yintercepts 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 yint.
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 yaxis and 1/n
i
2
on the xaxis.
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 Rsquared
on chart".
5.
From the Rydberg equation,
you know that the slope is equal
to R and the yintercept 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 24
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:
Put your plot of 1/
λ
vs 1/n
i
2
here.
Plotting Graph
Highlight yaxis values (numbers only) > \Insert > Chart\ > XY(scatter)>Subchart 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 rightclicking on any data point. You will want to display the equation and Rsquared
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This note was uploaded on 07/08/2008 for the course CHEM 162 taught by Professor N. during the Spring '08 term at University of Washington.
 Spring '08
 N.
 Atom, pH

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