Exercise 2: The absorbance of known concentration of potassium permanganate (KMnO4, purple color aqueous solution) is obtained by UV-vis spectrophotometer. The results are tabulated:14) [KMnO4] Absorbance (λ = 510 nm) 0.0000 1.029 x 10 2.058 x 10 3.087 × 10 4.116 x 10 0.000 0.257 0.518 0.771 1.021 (a) Plot the absorbance vs. concentration according to plotting guideline. (b) Obtain the best-fit straight line. (c) Calculate the concentration of an unknown sample of KMnO4 solution that an absorbance of 0.48
Exercise 2: The absorbance of known concentration of potassium permanganate (KMnO4, purple color aqueous solution) is obtained by UV-vis spectrophotometer. The results are tabulated:14) [KMnO4] Absorbance (λ = 510 nm) 0.0000 1.029 x 10 2.058 x 10 3.087 × 10 4.116 x 10 0.000 0.257 0.518 0.771 1.021 (a) Plot the absorbance vs. concentration according to plotting guideline. (b) Obtain the best-fit straight line. (c) Calculate the concentration of an unknown sample of KMnO4 solution that an absorbance of 0.48
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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![Exercise 2: The absorbance of known concentration of potassium permanganate
(KMnO4, purple color aqueous solution) is obtained by UV-vis spectrophotometer. The
results are tabulated:[4]
[KMnO4] Absorbance (λ = 510 nm)
0.0000
1.029 × 10
2.058 x 10
Hints:
3.087 × 10
4.116 x 10
0.000
0.257
0.518
0.771
1.021
(a) Plot the absorbance vs. concentration according to plotting guideline.
(b) Obtain the best-fit straight line.
(c) Calculate the concentration of an unknown sample of KMnO4 solution that has an
absorbance of 0.48
6. Type down the relationship between the Absorbance and [KMnO4] obtain
from the plot.
Y = Slope X + Y-intercept
7. Compare the above equation with Beer's-Lambart Law.
8.
Abs. = Ebc
&: Molar absortivity
b: path length, usually 1 cm
e: concentration of analyte
Comparison
3
Y=Slope X+Y-intercept
Abs.eb c
9. From the comparison (slope = b)
Abs.
10. Solving back for absorbance gives the unknown concentration, c=³
E](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7b5eb5c8-45eb-4f81-9c35-4d0ac308b1bd%2F3b4eca0b-ed6d-487a-a92d-474263de0c41%2F0ufl5ra_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Exercise 2: The absorbance of known concentration of potassium permanganate
(KMnO4, purple color aqueous solution) is obtained by UV-vis spectrophotometer. The
results are tabulated:[4]
[KMnO4] Absorbance (λ = 510 nm)
0.0000
1.029 × 10
2.058 x 10
Hints:
3.087 × 10
4.116 x 10
0.000
0.257
0.518
0.771
1.021
(a) Plot the absorbance vs. concentration according to plotting guideline.
(b) Obtain the best-fit straight line.
(c) Calculate the concentration of an unknown sample of KMnO4 solution that has an
absorbance of 0.48
6. Type down the relationship between the Absorbance and [KMnO4] obtain
from the plot.
Y = Slope X + Y-intercept
7. Compare the above equation with Beer's-Lambart Law.
8.
Abs. = Ebc
&: Molar absortivity
b: path length, usually 1 cm
e: concentration of analyte
Comparison
3
Y=Slope X+Y-intercept
Abs.eb c
9. From the comparison (slope = b)
Abs.
10. Solving back for absorbance gives the unknown concentration, c=³
E
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