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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
blue-green
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
y-intercept:
0.00260
R from y-intercept:
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 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)
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". 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
Put your plot of 1/
λ
vs 1/n
i
2
here.
Plotting Graph
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