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
bluegreen
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
yintercept:
0.00260
R from yintercept:
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 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
(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 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". 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 24
Put your plot of 1/
λ
vs 1/n
i
2
here.
Plotting Graph
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cost you 5 points.
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 Winter '08
 Chiu
 Chemistry, Atom, pH, Emission spectrum

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