3. In molecular absorption spectrophotometry, the relationship between transmittance and concentration is not linear while the absorbance vs concentration is linear. True False
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- What color would you expect for light transmitted through a solution with an absorption maximum at (a) 450; (b) 550; (c) 650 nm?Ineachofthe following parts, a molecularformula is given. Try to deduce thestructurethat isconsistent with the infrared spectrum. There may be more than one possible answer. a. C8H11N MICRONS 7 1002,5 6 8 9 10 11 12 13 14 15 16 19 25 90 80 70 60 50 CaHiN 20 10 1400 WAVENUMBERS (CM-1) 4000 3600 3200 2800 2400 2000 1800 1600 1200 1000 800 600 400 % TRANSMITTANCEThe arrangement of ions, atoms or molecules in crystals are best determined by which instrumental method? A) NMR b) mass spectroscopy c) atomic absorption spectroscopy d) x-ray diffraction
- The peak widths if the spectra of atomic UV-vis are different from the molecular UV-vis spectra. Explain why this occurs.At 350 nm, the absorbance of a solution of 60.06-ppm K2Cr207 in 0.0050 M H2SO, in 0.640 (b=1). What is the molar absorbitivity of K2Cr207 at this wavelength?Chemistry (b) Identify the indicated NMR chromophores entiotopic/diastereotopic/homotopic magnetically equivalent or non-equivalent. as as well as CH3 H CH3 c=c=c Hc-CH3 HH;C
- (d) The Beer-Lambert law states that the absorbance (A) of light by a solution in a cuvette is given by. A = ID==ecL In=-= where lo is the incident light intensity, / is the transmitted light intensity, e is the molar absorptivity, c is the concentration of the solution, and Lis the path length of the cuvette. (1) Light with a wavelength of 800 nm is passed through a cuvette containing a solution of Coumarin dye. After passing through the cuvette, the light intensity was reduced to 10% of its initial value. What is the absorbance of the solution of Coumarin dye? (1) The concentration of the Coumarin dye is 0.004 mol dm3, and the cuvette has a path length of 1 cm. What is the molar absorptivity of Coumarin dye at 800 nm, in units of m² mot¹?2. Express the following absorbances in terms of percent transmittance. a ) 0.918 b) 0.072Ineachofthe following parts, a molecularformula is given. Try to deduce thestructurethat isconsistent with the infrared spectrum. There may be more than one possible answer. a. C3H5O2CI (Hint: chloride located at the a-position) MICRONS 1002,5 5 6 10 11 12 13 14 15 16 19 90 80 70 60 50 40 30 CaH,O2GI 20 1728 cm 1 10 1400 WAVENUMBERS (CM-') 4000 3600 3200 2800 2400 2000 1800 1600 1200 1000 800 600 400 % TRANSMITTANCE
- Express the following absorbances in terms of percent transmittances.(a) 0.0356(b) 0.379(c) 0.485Does a calibration curve alwasy compare concentration and absorbance? Or can it compare concentration and %T as well?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.