The Lambert-Beer law can be written in the form: IT/Io = 10 (40). Explain the meaning of each term. The above equation i

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The Lambert Beer Law Can Be Written In The Form It Io 10 40 Explain The Meaning Of Each Term The Above Equation I 1 (98.35 KiB) Viewed 84 times

The Lambert-Beer law can be written in the form: IT/Io = 10 (40). Explain the meaning of each term. The above equation is non-linear in concentration; write down a linear form of the eq. with the same terms. A solution containing a thiourea complex of bismuth (III) has a molar absorptivity, E, of 9.3x10'dm'molcm' at a wavelength of 470 nm. What is the absorbance of a 2.00x10mol dm solution of the complex when measured in a 2.0 cm cell? Can one predict the absorbance of the same solution & cell if the wavelength is changed to 325 nm? Sketch and label the component parts of a typical absorption spectrometer. The Beer-Lambert law may be written as: 1. =s1C 2 10.10 ( 3 Explain the meaning of each term. You are setting up an absorption spectrometer to determine the concentration of a gas which is present in very small amounts in the atmosphere. During initial testing between two tall buildings, you measure a 90% transmission when the concentration is known to be 2x10 mol m? What is the distance between the two buildings? You may assume that the molar absorptivity, 6, of the gas in question is 5x10m'mol-'m'' under these conditions. (a) Arrange the following types of spectroscopic transition in order of increasing energy: vibrational, electronic, rotational. (b) In which regions of the electromagnetic spectrum do each of the transitions in part occur? (c) The red colour of tomatoes is due to the presence of lycopene, a carotenoid pigment, which absorbs strongly at 22,222 cm. (d) What wavelength of light does lycopene absorb? Give your answer in nm. (e) What colour is this light? (0) What type of spectroscopic transition gives rise to this absorption? (g) When light of a certain wavelength passes through a 1 cm cell containing a solution of lycopene of concentration 1x10-mol dm, the absorbance is 0.22. Another solution of lycopene in a cell of the same path length has an absorbance of 0.30 at this wavelength. Determine the concentration of this solution. The absorbance of a 0.5 mol.dm solution, 5 cm thick is 0.62 at 260 nm: (a) Calculate the molar absorption coefficient, (b) What fraction of the incident light is transmitted by the solution? (c) What thickness of 0.5 mol. dm solution would be required to transmit 5% of the incident radiation? (d) What is the absorbance at 350 nm? An HBr molecule has a force constant of 411.5 Nm"! Calculate the vibrational stretching frequency 5