Table 2 Absorbance vs CoCl2 concentration Test Tube Number Cobalt Chloride Concentration (mol/mL) Absorbance at 510 nm 1 0.000 0.000 2 0.009 0.024 3 0.018 0.055 4 0.027 0.085 5 6 0.036 0.045 0.112 0.138 7 (Unknown) 0.088 explain the results of this experiment and find the unknown concentration
Table 2 Absorbance vs CoCl2 concentration Test Tube Number Cobalt Chloride Concentration (mol/mL) Absorbance at 510 nm 1 0.000 0.000 2 0.009 0.024 3 0.018 0.055 4 0.027 0.085 5 6 0.036 0.045 0.112 0.138 7 (Unknown) 0.088 explain the results of this experiment and find the unknown concentration
Physical Chemistry
2nd Edition
ISBN:9781133958437
Author:Ball, David W. (david Warren), BAER, Tomas
Publisher:Ball, David W. (david Warren), BAER, Tomas
Chapter9: Pre-quantum Mechanics
Section: Chapter Questions
Problem 9.8E: Convert a a wavelength of 218A to cm1, b a frequency of 8.0771013s1 to cm1, c a wavelength of 3.31m...
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Table 2 Absorbance vs CoCl2 concentration
|
Test Tube Number |
Cobalt Chloride Concentration (mol/mL) |
Absorbance at 510 nm |
|
|
|
|
|
1 |
0.000 |
0.000 |
|
2 |
0.009 |
0.024 |
|
3 |
0.018 |
0.055 |
|
4 |
0.027 |
0.085 |
|
5 6 |
0.036 0.045 |
0.112 0.138 |
|
7 |
(Unknown) |
0.088
|
explain the results of this experiment and find the unknown concentration
Transcribed Image Text:Wavelength (nm)
400
410
420
430
440
450
460
470
480
490
500
510
520
530
540
550
560
570
580
590
600
610
620
630
640
650
660
670
680
690
700
7
7
Absorbance
0.035
0.043
олоо
0.091
0.143
0. 269
0.321
0.304
0.398
0 445
toe'o
ольо
0.452
0.395
0.297
0.005
0.137
0500
о.оча
seo'o
геото
②
0.018
о.оде
0.62
ов
0.013
чтото
0.064
DOIL
2.8
602
0.003
о. ос
06|
6
PgUp
Transcribed Image Text:Add 5.0 mL of the unknown cobalt chloride to test tube 7.
2.
3. Cover test tubes 2-5 with parafilm and mix using a vortex mixer.
Set the wavelength on the spectrophotometer to the absorption peak found in procedure 1.
4.
Using a clean plastic transfer pipette for each of the solutions, add 3.0 mL of solution from
5.
each test tube into separate cuvettes.
6. Blank spectrophotometer using cuvette 1 by pressing "0/ABS."
7.
Put the remaining cuvettes in the spectrophotometer and record the absorbances of each
cuvette in the table below. There is no need to blank the spectrophotometer before each
cuvette since the wavelength is not being changed.
8. Compare the absorbance to the standard cobalt chloride curve and read the concentration
directly from the graph as shown in the introduction.
9. Pour the cobalt chloride solutions into the labeled waste bottle.
Cobalt Chloride
Test Tube Number
Absorbance at 510 nm
Concentration
(mol/mL)
1
0.000
0024
0.009
0.024
0.018
0.055
0.027
#
ตาร
0.015
0.112.
0.036
0.045
0-138
M (Unknown)
COTE
2
3
4
5
6
7
460
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