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

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.

Question

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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