Colorimetry - Group Report Template
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School
University of New Hampshire *
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Course
403.10
Subject
Mathematics
Date
Jan 9, 2024
Type
Pages
3
Uploaded by BrigadierKomodoDragonMaster894
Colorimetry and the Killer Cup of Coffee
Group Report
Include your name and your lab partner’s name and submit the same file to both partners’ Canvas
accounts if and only if both of you collaborated on this report.
Samantha Pagnozzi, Hailey Beaudoin
Do not modify or remove the question text.
Do not use bold font in your answers.
Do not use red text in your answers.
1.
Report which wavelength you selected for use in part I.
470 nm
2.
Include a typed copy of the completed Data Table 1.
Test Tube
FeSC
࠵?
!"
(mL)
Water (mL)
Concentration
FeSC
࠵?
!"
(M)
Absorption
Blank (0)
0
10
0
-0.001
1
2.0
8.0
0.03
0.171
2
4.0
6.0
0.06
0.372
3
6.0
4.0
0.09
0.547
4
8.0
2.0
0.12
0.761
5
10.0
0.0
0.15
0.881
3.
Include a copy of the concentration calibration graph from part II.
4.
Write the equation for the linear fit line from your graph in the form
y
=
mx
+
b
, using the
values for
m
and
b
that you recorded in the Evidence Record. For example, if
m
= 3 and
b
= 6,
then the equation for the line is
y
= 3
x
+ 6.
Y = 6.049x + 0.001355
5.
The accuracy of your standard concentrations is indicated by the correlation coefficient (also
known as the
r
value). Report your
r
value.
R: 0.9982
6.
Show how to use the equation of the line and the measured absorbance of an unknown to
find the concentration of FeSCN
2+
as follows:
a.
In the equation for the line of best on the calibration graph, which physical quantity is
represented by
y
and which physical quantity is represented by
x
?
Y represents absorbance and X represents concentration in m/L.
b.
Rewrite the equation so that you have a formula to find concentration from absorbance
(isolate concentration on one side of the equation).
X = (Y - 0.001355) / 6.049
c.
Choose one of the unknowns you measured and substitute the measured quantities for
the unknown into your formula to confirm that the concentration recorded from the
interpolation calculator in Logger Pro agrees with the concentration you calculate using
your formula.
Unknown: 7
X= (0.737-0.001355)/(6.049)
X= 0.1216 m/L
This formula’s concentration value matches what we measured during lab for the unknown.
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