A solution of a dye absorbs light ofwavelength 480 nm, and for this absorption,the extinction coefficient is 18600 dm38.mol-1 cm-1. A sample of the dye ofunknown concentration is placed in anoptical cell of path length 1 cm and theabsorbance reading is 0.18. What is theconcentration of the solution?2.0 x 10-8 mol dm-30.026 mol dm-39.7x 10-6 mol dm-33.0 x 10-4 mol dm-3

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Answered: A solution of a dye absorbs light of…

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter1: Introduction

Section: Chapter Questions

Problem 1.11QAP

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The most intense absorption band in the visible spectrum of [Mn(H2O)6]2+ is at 24,900 cm-1 and has a molar absorptivity of 0.038 L mol-1 cm-1. What concentration of [Mn(H2O)6]2+ would be necessary to give an absorbance of 0.10 in a cell of path length 1.00 cm?
The molar absorption coefficient of a substance dissolved in hexane is known to be 227 dm3mol-1cm-1 at 290 nm. Calculate the percentage reduction in intensity when UV radiation of that wavelength passes through 2.00 mm of a solution of concentration 2.52 mmol dm-3.
For a molecule in solution for which the absorption A at λ max is measured as 0.85 for a concentration of 0.3 mol m-3 in a spectrometer cell of path length 1 cm, the molar absorptivity (ɛ), in m2 mol-1, is which of the following? 2.8 56 0.3 2.8 x 102
Extinction coefficient of a dye is 7200 M-1 cm-1. Assuming a path length of the cuvette to be 1 cm, what is the concentration of solution when the absorbance is 0.300 at 500 nm.
The absorption coefficient of bovine immunoglobin (molecular mass= 150,000 Daltons) at 280nm is 210,000 M^-1 cm^ -1. What is the absorbance of a 0.1 mg ml^-1 solution across a 1 cm path? What percentage of the incident light is transmitted by this solution?
Thienothiophene and sexithiophene are conjugated molecules used in printed organic electronics. A chlorobenzene solution of equal concentrations of the two molecules was prepared and its absorbance was recorded with a 0.01 cm sample cell to give 0.88 % transmittance (T) at 400 nm. Calculate the concentration of each of the molecules given that the molar absorption coefficient of the thienothiophene is 23,000 L.mol-1cm-1 and the sexithiophene is 34,000 L.mol-1cm-1. Remember that absorbance is additive.
Consider ultraviolet radiation of wavelength 300 nm passing through 1.50 mm of a solution of absorbing substance at concentration 0.717 mmol dm-3. Transmission was found to be 61.5%. Calculate the molar absorption coefficient of the solute at 400 nm and express your answer in cm2 /mol.
a.) The molar absorption coefficient of a substance dissolved in benzene is measured to be 802 L mol-1 cm-1 at 492 nm. Calculate what fraction of the incident light intensity of that wavelength passes through 2.97 mm of a solution of concentration 3.06 mmol/L. b.) The molar absorption coefficient of a solute at 524 nm is 103 dm3 mol-1 cm-1. When light of that wavelength passes through a 4.70 mm cell containing a solution of the solute, 59.4 per cent of the light was absorbed. What is the concentration of the solution?Ans = ______ mmol dm-3
the absorbance of an equilibrium mixture of Fescn2+ was measured at 447nm and found to be 0.319. What is the equilibrium concentration of FeSCN2+?
The molar absorptivity for Blue #1 dye is 1.30105 M‒1 ·cm‒1 at 629 nm. Calculate the expected absorbance of solution of Blue #1 with a concentration of 4.50×10–6M when measured at 629 nm in a 1.50 cm cell.
The IR frequency of C≡N¯ in fac-[IrCl3(C≡N)3] is 2200 cm-1. Estimate the IR frequency of C≡N¯ for fac-[IrF3(C≡N)3] with an explanation.

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