Five standard chromium (VI) solutions were prepared through serial dilution technique with corresponding absorbance readings at 540 nm wavelength as follows: Absorbance ConcentrationA1 = 0.650 C1 = 1.9 ppmA2 = 0.712 C2 = 4.0 ppmA3 = 1.370 C3 = 6.0 ppmA4 = 2.050 C4 = 8.0 ppmA5 = 3.423 C5 = 10.0 ppmThe sample solution gives an average absorbance reading of 0.713. What is then the concentration of chromium (VI) ion in the sample?(Note: please provide necessary solutions)

According to Lambert-Beer's law absorbance of a solution relates with the concentration by following…

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The sample solution gives an average absorbance reading of 0.713. What is then the concentration of chromium (VI) ion in the sample?

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions

Section4.8: Stoichiometry Of Reactions In Aqueous Solution-titrations

Problem 2RC

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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.

Question

Five standard chromium (VI) solutions were prepared through serial dilution technique with corresponding absorbance readings at 540 nm wavelength as follows:

Absorbance Concentration

A₁ = 0.650 C₁ = 1.9 ppm

A₂ = 0.712 C₂ = 4.0 ppm

A₃ = 1.370 C₃ = 6.0 ppm

A₄ = 2.050 C₄ = 8.0 ppm

A₅ = 3.423 C₅ = 10.0 ppm

The sample solution gives an average absorbance reading of 0.713. What is then the concentration of chromium (VI) ion in the sample?

(Note: please provide necessary solutions)

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