Which of the following best fit this spectroscopic data? All 'H NMR data shown as x.xx ppm (splitting), integration. 3.17 ppm (s), 3 7.42 ppm (d), 2 7.30 ppm (d), 2 1.49 ppm (d), 3 4.30 ppm (q). 1 PPM D
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- An unknown sample of Yellow 6 solution has the absorbance equal to 0.96. The slope of the Beer's law calibration plot constructed using a 3.8E-5M stock solution of Yellow 6 is 0.0117 (%) 1. What is the molar concentration of the unknown sample (in mole L-¹)? Please give your answer to 3 significant figures (1 additional SF is used to minimize rounding errors). M HintA UVIVIS molecular absorption spectrometric determination of analyte X in aqueous solution gave the following calibration data (absorbances corrected for the blank). Estimate the concentration of Xin an aqueous sample that yielded an instrument response of 0.238 (A 1.00- mL cuvette was used for all absorbance measurement s) OA. 7.7 ppm OB. 8.0 ppm, 148 O c. 23.8 ppm O D.0.0308 ppb OE. 0.8 ppm Concentration (ppm X) 1.0 2.0 5.0 7.0 8.5 10.0 Absorbance 0.031 0.068 0.150 0.221 0.262 0.308 3:49 PM4. The total absorbance of a solution is the sum of the absorbances of all different materials present. AT = Aa + Ap + Ac .. etc. At 427 nm, the molar absorbtivity of Yellow #5 is 2.73×10°M-1-cm1. At 427 nm the molar absorptivity of Red 40 is 7.49x103 M-1.cm-1. Calculate the total absorbance of a solution in which the concentration of Yellow #5 = 2.00x10-5 M and the concentration of Red 40 = 4.80x10-5 M, when measured at 427 nm in a 1.00 cm cell.
- The accompanying absorption data were recorded at 390 nm in a 1.00 cm cells for a continuous variation study of the colored product formed between Cd and the complexing reagent R. 1. Solution Reagent volumes, mL A390 cCd = 1.25 x 104 M cR = 1.25 x 104 M 10.00 0.00 0.00 1 9.00 1.00 0.174 2 8.00 2.00 0.353 3 7.00 3.00 0.530 4 6.00 4.00 0.672 5 5.00 5.00 0.723 4.00 6.00 0.673 7 3.00 7.00 0.537 8. 2.00 8.00 0.358 9 1.00 9.00 0.180 10 0.00 10.00 0.000 Find the ligand-to-metal ratio in the product. b. Calculate an average value for the molar absorptivity of the complex and its uncertainty. Assume that in the linear portions of the plot the metal is completely complexed. Calculate Kf for the complex using the stoichiometric ratio determined in (a) and the absorption data at the point of intersection of the two extrapolated lines. а. c.The following data are obtained from three standard soltions using UV-Vis spectroscopy: What is the colar concentration (M) of an unknown solution with an absorbance of 0.180 at 255 nm? The unknown solution contains the same analyte as the standard solution does. The molar mass of the analyte is 188.65 g/mol a) 4.82x10-5b)1.9x10-3c)3.60x10-4d)1.9x10-5e)1.8x 10-45- In Trans-XeF Cl; determine Itotal, Ttran., Frot. and Tvib., Which mode(s) is (are) active in IR and Raman spectroscopy?
- Calculate the amount of reagent needed to prepare 100 mL of a standard solution of 1000 ppm Au3+ in lN HCl for atomic absorption spectroscopy from standard HAuCl4.Identify the following in the given IR Mass spectrum. Compound 1 Mass Spectroscopy: Interpretation of peaks: Compound 1 Mass Spectroscopy: MASS SPECTRUM 100 80 60 40 20 0.0- 10 20 30 40 50 60 70 m/z Interpretation of peaks: Rel. IntensityA compound X is to be determined by UV-visible spectrophotometry. A calibration curve is constructed from standard solutions of X with the following results: 0.50 ppm, A = 0.24; 1.5 ppm, A = 0.36; 2.5 ppm, A = 0.44; 3.5 ppm, A = 0.59; 4.5 ppm, A = 0.70. A solution of unknown X concentration had an absorbance of A = 0.50. Find the slope and in te rcept of the calibration curve, the standard error in Y, the concentration of the solution of unknown X concentrat ion, and the standard deviation in the concentration of X. Construct a plot of the calibration curve and determine the unknown concentra tion by hand from the plot. Compare it to that obtained from the regression line.
- Explain the need for an internal standard in quantitative NMR AND indicate which properties are desirable in an internal standard to be used in quantitativeLlë 4 A (0.002M) Cu2+ solution gave an absorbance of O.50 at 560 nm in a 1.0 cm :cell. The molar absobitivity of solution is equel * 2.24 O 250 1120 O 0.0041. Question: Pd (1I), Au (III) methiomeprazine (C19 H24 N2S2) with the complex. A mixture of their complexesis being analyzed. Pd (II) complex at 480 nm, The measurement results for Au (III) with max peak at 635 nm are as follows. of the mixture What is the concentration?(b=1) Pd(II) Au(III) Mixture 480 nm 3,55x103 2,96x103 0,533 635 nm 5,641x0³ 1,45x10 0,590