b) Helen performed an experiment with Fe(SCN)2+ complex at 580 nm. Calculate the percenttransmittance of 4.47 x 105 M of Fe(SCN)2+ complex using a 1.00 cm cuvette. Givenmolar absorptivity of Fe(SCN)²+ complex at 580 nm is 7.00 x 10³ L cm³¹ mol¹¹. Determinethe new percent transmittance if the cuvette is replaced with a 2.50 cm cell andconcentration of the complex is decreased by half.c) A testing lab received an unknown water sample sent for phenol analysis. Anna, thechemist prepared the water sample according to USEPA method. Unknown water sampleis first steam-distilled and a 50 mL aliquot of the distillate was diluted with distilled waterin a 100 mL volumetric flask. She performed spectrophotometry analysis at 460 nm usinga 1.00 cm cuvette. A 4 ppm phenol standard recorded absorbance reading of 0.424 whileunknown water sample recorded 0.394. Calculate the initial concentration of phenol (inppm or mg/L) of unknown water sample.

Given: concentration of Fe(SCN)2+, c = 4.47 x 10-5 M length of cuvette = 1 cm molar absorptivity, ε…

b) Helen performed an experiment with Fe(SCN)²+ complex at 580 nm. Calculate the percent transmittance of 4.47 x 105 M of Fe(SCN)2+ complex using a 1.00 cm cuvette. Given molar absorptivity of Fe(SCN)²+ complex at 580 nm is 7.00 x 10³ L cm³¹ mol-¹. Determine the new percent transmittance if the cuvette is replaced with a 2.50 cm cell and concentration of the complex is decreased by half.

b) Helen performed an experiment with Fe(SCN)²+ complex at 580 nm. Calculate the percent transmittance of 4.47 x 105 M of Fe(SCN)2+ complex using a 1.00 cm cuvette. Given molar absorptivity of Fe(SCN)²+ complex at 580 nm is 7.00 x 10³ L cm³¹ mol-¹. Determine the new percent transmittance if the cuvette is replaced with a 2.50 cm cell and concentration of the complex is decreased by half.

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

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

Section4.9: Spectrophotometry

Problem 4.14CYU

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