Page 1 of 10
EXPERIMENT 6: ATOMIC EMISSION SPECTROSCOPY(AES)
Points assigned to tables, graphs
Part I.
Measuring the Hydrogen Emission Spectrum
questions, and calculations.
Part II.
An Application of AES; Determination of Sodium
Part I.
Measuring the Hydrogen Emission Spectrum
DATA
2
Table 1.
Hydrogen Emission Data
Color
Wavelength, nm
violet
425
656.7
2
bluegreen
480
486.5
red
660
434.3
410.1
397.4
Spectroscope
Data
Ocean Optics
Spectrometer
λ
(nm), descending
order
This template = 60 pts
Use these in the
data analysis
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:
Data here will
autofill into the
third column of
Tables 24
350
400
450
500
550
600
650
700
0
500
1000
1500
2000
2500
3000
3500
4000
4500
Intensity vs. Wavelength
Column B
Wavelenth (nm)
Intensity
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Page 2 of 10
A: Data Analysis
2
0.2500
656.7
0.001523
3
0.1111
486.5
0.002055
4
0.0625
434.3
0.002302
1
5
0.0400
410.1
0.002438
6
0.0278
397.4
0.002516
2
Slope:
0.0043975
R from slope:
0.0043975
No
yintercept:
0.0025990
R from yintercept:
0.0025990
3
3
0.1111
656.7
0.001523
4
0.0625
486.5
0.002055
5
0.0400
434.3
0.002302
1
6
0.0278
410.1
0.002438
7
0.0204
397.4
0.002516
2
Slope:
0.010962
R from slope:
0.010962
Yes
yintercept:
0.002741
R from yintercept:
0.010963
3
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
Table 3.
Hypothesis #2; n
f
= 2; n
i
=
3, 4, 5, 6, 7
n
i
values
1/n
i
2
λ
(nm)
1/
λ
nm
1
nm
1
Is n
f
=2?
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.
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
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.)
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 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.
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '08
 Chiu
 Chemistry, Linear Regression, Atom, pH, Emission spectrum

Click to edit the document details