100 FTIR NEAT 90 80 70 60 50 3043. 1481, 1463.7 956.5 30 1263. 20 1718 3 2500 2250 17 50 1500 1250 1000 750 500 250 500 4250 37 50 3500 3250 3000 2750 2000 4000 Wavenumbers (cm-1) ©2018, Sigma-Aldrich Co. ALL RIGHTS RESERVED Observed absorption (cm-1) Expected frequency range (cm1) (from IR absorption table) Bond vibration Structure: Functional group(s):. 40 10 % Transmittance

100 FTIR NEAT 90 80 70 60 50 3043. 1481, 1463.7 956.5 30 1263. 20 1718 3 2500 2250 17 50 1500 1250 1000 750 500 250 500 4250 37 50 3500 3250 3000 2750 2000 4000 Wavenumbers (cm-1) ©2018, Sigma-Aldrich Co. ALL RIGHTS RESERVED Observed absorption (cm-1) Expected frequency range (cm1) (from IR absorption table) Bond vibration Structure: Functional group(s):. 40 10 % Transmittance

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter25: Instruments For Optical Spectrometry

Section: Chapter Questions

Problem 25.22QAP

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Potassium dichromate and potassium permanganate have overlapping absorptionspectra in 1M H2SO4 . K2Cr2O7 has an absorption maxima at 440 nm, and KMnO 4 has a band at 545nm (the maximum is actually at 525 nm, but the longer wavelength is generally used whereinterference from K2C2O7 is less). A mixture is analyzed by measuring the absorbance at these twowavelengths with the following results: A 440 =0.405, A 545 =0.712 in a 1-cm cell. The absorbances ofpure solutions of K2Cr2O7 (1x10 -3 M) and KMnO 4 (2.00x10 -4 M) in 1 M H 2 SO 4 , using the same cell gavethe following results: A Cr,440 = 0.374, A Cr,545 = 0.009, A Mn,440 =0.019, A Mn,545 = 0.475. Calculate theconcentrations of dichromate and permanganate in the sample solution.
Below is given the FT-IR (Fourier Transform Infra Red) data of a 1:1 (by weight) mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC). Absorbance Pis given as a function of wavenumber, m. Regress the above data to a second order polynomial P = a, + a, m+ az m? Find the absorbance at m = 1000 cm-1 Wavenumber, m Absorbance, P (arbitrary unit) ( cm-1) 804.184 0.1591 827.326 0.0439 846.611 0.0050 869.753 0.0073 889.038 0.0448 892.895 0.0649 900.609 0.1204
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