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