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Can you explain me the Beer- Lamber Law
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- Which parameter between "solvent polarity function" and dielectric constant show better correlation with the peak positions? (cyclohexane, dioxane, acetonitrile, ethanol, ethylene glycol)The beer-lambert law is A = εlc, where A is the absorbance, ε is the molar extinction coefficient, l is the path lengh in cm and C is the concentration. The beer lambert law can be expressed in the form of y=mx + b, where A is y, and C is x.What is b and how is it used to calculate the final absorbance?What structural features of Hydroxypropyl Acrylate (HPA) allow it to be detected by HPLC?
- [X] (ppm) 0.00 10.0 15.0 20.0 25.0 30.0 35.0 x-axis Resources UV-Vis absorbance data for molecule X collected at 425 nm using a 3.50 cm cuvet is given in the table. [X] (M) 0.00 1.00 × 10 4 1.50 × 10-4 2.00 × 10-4 2.50 × 10-4 3.00 x 10-4 3.50 x 10-4 O %T %T T A 100.0 1.000 0.000 49.4 0.494 0.306 34.9 0.349 0.457 25.3 0.253 0.597 17.3 0.173 0.761 15.4 0.154 0.813 13.9 0.139 0.857 Prepare a plot using the linear range of the data to determine the molar absorptivity. What should be plotted on each axis to determine the molar absorptivity of molecule X at this wavelength? x Give Up? y-axis Hint OT 8:1The Beer-Lambert law you'll be using to determine the concentration of an unknown is A = ebc where A is the absorbance measured on the spectrometer, e (epsilon) is the molar absorptivity in M cm1, b is the path length of the cell (the diameter of the cuvette which is filled with solution), and c is the concentration of the solution in M. If you have a sample which has an absorbance of 1.17, a molar absorptivity of 1 Mcm1, and a cuvette that is 1.15 cm wide, what is the concentration of the sample in M? Give your answer to 3 decimal places (e.g.: 0.123)3. Identify C-Cl stretching peaks in CDC13 and CHC13 spectra. Do these peaks have exactly the same frequencies for both compounds? Explain your answer. 4. Is the C==O stretching frequency the same for acetone and deuterated acetone? Explain your answer. 5. Identify C==O overtone in acetone spectrum which corresponds to the transition from ground level, n=0, to the second excited level, n=2.
- a.) The spacings of the rotational fine structure lines of carbon dioxide 12C16O2 are determined from IR spectroscopy to be 0.7604 cm-1. Calculate the C=O bond length of the molecule (given masses: m(12C) = 12 amu, m(16O) = 15.9949 amu). Ans = ________ Angstroms b.) A molecule in a gas undergoes 3e+09 collisions in each second. Suppose that(i) every collision is effective in deactivating the molecule rotationally. Calculate the linewidth of rotational transitions in the molecule. Ans = _________ MHz(ii) Suppose that 1 collisions in 10 are effective. Ans = _______ MHzThe weight of proteins or nucleic acids in solution is often determined by UV spectroscopy using the Beer-Lambert law. For example, the molar absorptivity, ɛ, of double-stranded DNA at 260 nm is 6670 M'cm-!. The formula weight of the repeating unit in DNA (650 Daltons) can be used as the molecular weight. What is the weight of DNA in 4.0 mL of aqueous buffer if the absorbance, measured in a 1-cm cuvette, is 0.35? Choose the correct value from the drop-down list provided. Weight of DNA: gramexplain why C–O stretching occurs at 1100 cm-1 and C=O stretching occurs at 1750 cm-1
- (i) (ii) (ii) Of the following conjugated dyes in solution, which MOST LIKELY has the highest degree of conjugation. (0) () It is inpossible to detennine based on the provided intormation.Absorption bands in the region of 1600-1700 cm-1 are often used for quantification of caffeine. What does the bands in this region refer to?The IR spectrum of 2-methyl-1-butanol (H;CCH,CH(CH;) CH,OH) and tert-butyl methyl ether [(CH;);COCH3] are shown below. Assign cach spectrum to the correct com- pound and identify the frequencies and the functional groups used to support your assignment. λ (μm) 6 7 8 9 10 11 12 1314 15 2.5 100 3 5 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm-1) A (µm) 7 8 9 10 11 12 13 14 15 2.5 100 3 5 20 4 6 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm¬!) (%) Transmission (%) Transmission 20