A solution containing 5ppm KMnO4(F.W.159) has a transmittance of 0.360 measured in 1 cm cell at 500 nm. The molar absorptivity of KMnO in L mole-¹ cm-¹ is: 1.9 x 104 1.1 x 104 1.4 x 104 2.7 x 104 Next

A solution containing 5ppm KMnO4(F.W.159) has a transmittance of 0.360 measured in 1 cm cell at 500 nm. The molar absorptivity of KMnO in L mole-¹ cm-¹ is: 1.9 x 104 1.1 x 104 1.4 x 104 2.7 x 104 Next

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter24: Introduction To Spectrochemical Methods

Section: Chapter Questions

Problem 24.2QAP

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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.

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A solution containing 5ppm KMnO4(F.W.159) has a transmittance of 0.360 measured in 1 cm cell at 500 nm. The molar absorptivity of
KMnO in L mole-¹ cm-¹ is:
1.9 x 104
1.1 x 104
1.4 x 104
2.7 x 104
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A solution containing 5ppm KMNO4(F.W.159) has a transmittance of 0.360 measured in 1 cm cell at 500 nm. The molar absorptivity of KMNO4 in L mole1 cm 1 is: O 1.1 x 104 1.9 x 104 1.4 x 104 2.7 x 104
At 520 nm with a 1.00 cm cell a 8.24 ppm solution of KMnO4 has a transmittance of 0.126. What is the molar absorptivity of KMnO4 at 520 nm?
The molar absorptivity for aqueous solutions of phenol at 211 nm is 6.17 × 103 L cm-1 mol-1. Calculate the permissible range of phenol concentrations if the transmittance is to be less than 85% and greater than 7% when the measurements are made in 1.00-cm cells.
6 A solution containing 4.48 ppm KMnO4 exhibits 85.9% transmittance in a 1.00 cm cell at 520 nm. Calculate the molar absorptivity of KMnO4 at this wavelength.
3.) The accuracy of a spectrophotometer is evaluated by preparing a solution of 60.06 ppm K2Cr2O7 and measuring its absorbance at a wavelength of 350 nm in a cell with a pathlength of 1.00 cm. The expected absorbance is 0.640. What is the expected molar absorptivity of K2Cr2O7 at this wavelength? 4.) A solution’s transmittance is 35.0%. What is the transmittance if you dilute the solution to half of its initial concentration?