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- The accompanying data (1.00-cm cells) were obtained for the spectrophotometric titration 10.00 mL of Pd(II) with 2.44 10-4 M Nitroso R(O. W Rollins and M. M. Oldham, Anal. chem .,1971, 43, 262, DOI: 10.1021/ac60297a026). Calculate the concentration of the Pd(II) solution, given that the ligand-to-cation ratio in the colored product is 2:1Name of Experiment: Spectrophotometry of a two- component mixture: Determination of CO and Ni as EDTA complexes. Q1: Purpose of experiment Q2: Discusion1) Pd (II) with Au (III) methiomeprazine (C19 H24 N2 S2) complex. A mixture of their complexes is being analyzed. Pd (II) complex at 480 nm, The measurement results for Au (II) with a maximum peak at 635 nm are as follows. Of this mixture What is its concentration? (b = 1) Pd(II) ɛ Au(III)ɛ 2.96x 103 A 480 nm 3.55x 103 0.533 635 nm 5.64x 102 1.45x 104 0.590
- Pt (II) and TI (III) are two metals that can be determined by UV spectrophotometry with Metromeprazine (C19H24N2S2). The PtM complex has a max at 545 nm and the TIM complex at a max of 621 nm. To 25 ml of the sample with excess of reagent M, they were diluted to 50 ml with the appropriate solvent. Calculate the concentration of Tl in the test sample with the following data. ɛ (M' cm) 545 nm ɛ (M cm) 621 nm PtM 6.29 E4 1.15 E3 TIM 3.55 E2 5.64 E4 Absorbance b = 1 cm 0.595 0.518 Notes Molecular weight of Pt= 195.078 g/mol Molecular weight of Ti = 47.90 g/mol The molecular weight of Metromeprazine= 344.14 g/mol Оа. 1.250E-03м O b. 2.48E-04 M О с. 1.80E-05 М O d. 7.124E-07 M O e. 1.150E-03 M3.4 Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are Eco=36,400 and EN=5520 at 510 nm and Eco-1240 and EN=17,500 at 656 nm. A 0.425 g sample was dissolved and diluted to 50.0 mL. A 25.0 mL aliquot was treated to eliminate interferences, after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution had an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00 cm cell. Calculate the concentration (parts per million) of Co and Ni in the sample.Vanadium forms a complex with peroxide which absorbs at 460 nm. A 3.96 x 10-4M solution of vanadium peroxide (Solution A) exhibited an absorbance of 0.624 at 460 nm in a 1.000-cm quartz cuvette; a blank solution containing only solvent had an absorbance of 0.029 at the same wavelength. a) Find the molar absorptivity of vanadium peroxide complex. b) An unknown solution of vanadium peroxide complex in the same solvent and cuvette had an absorbance of 0.375 at 460 nm. Find the concentration of vanadium peroxide in the unknown solution. c) A concentrated solution vanadium peroxide in the same solvent was diluted from an initial volume of 5.00 mL to a final volume of 25.00 mL (Solution C) had an absorbance of 0.733 in the same cuvette. What is the concentration of vanadium peroxide in the concentrated solution (Solution B)? Answer the following questions: 1. Molar Absorptivity (M1 cm) of vanadium peroxide complex from Solution A at 460 nm 2. Concentration of vanadium peroxide in unknown…
- Why is it necessary to buffer the solution with sodium acetate in the spectrophotometic determination of iron in FAS (ferrous ammonium sulfate or Mohr's salt)? Be specific.The value of 10Dq in the complex K3[Co(C204)3] is ~=-m~=-- the * complex [Co(H20)6]CI3 less than in O bigger than in O equal to O The complex [Co(H20)6]CI2 is less stable than the complex * [Zn(H20)6]CI2 Error |:| true |:| The Na2[CoBr4] complex is more * stable than the K2[CoCl4] complex Error |:| true |:|The ESI mass spectrum (positive mode) of the complexshown below contained a peak envelope with m/z527.9 (100%), 528.9 (15%), 529.9 (46%), 530.9(7%), 531.9 (0.5%). A group of peaks of lowintensity and with spacings of m/z ¼ 1 was alsoobserved around m/z 994. (a) What is the oxidationstate of Cu in the complex? (b) Assign the majorpeak and account for the isotope pattern. (c) Suggesthow the minor peak arises. [The mass spectrum of the complex complex is shown on pic.]
- 2. One of the common methods used to determine phosphorus in urine isto treat urine with molybdenum(VI) resulting in a complex compoundof 12- molybdophosphate and then reduced using ascorbic acid produces a blue-colored compound called molybdenum blue (max = 650 nm). A patient's urine sample collected over 24 hours produced 1122 mL of urine. A total of 1 mL of the sample was treated with Mo(VI) and ascorbic acid and diluted until it reached a volume of 50 mL. A calibration curve is also prepared by treating 1 mL of standard phosphate solution in the same way. The absorbance of the standard solution and the sample was then measured at a wavelength of 650 nm and produced the following data: Solution Absorbance at λ 650 nm Phosphate 1 ppm Phosphate 2 ppm Phosphate 3 ppm Phosphate 4 ppm Urine sample 0,230 0.436 0,638 0,848 0.518 a. Create a calibration curve for the data and determine the slope, intercept, and R values of 2! Determine the concentration of phosphates found in urine samples…report A. J. Mukhedkar and N. V. Deshpande (Anal. Chem., 1963, 35, 47, DOI: 10.1021/ac60194a014) on a simultaneous determination for cobalt and nickel based on absorption by their 8-quinolinol complexes. Molar absorptivities (L mol¹ cm¹) are &c. = 3529 and &N= 3228 at 365 nm and &c. = 428.9 and EN = 0 at 700 nm. Calculate the concentration of nickel and cobalt in each of the following solutions (1.00-cm cells): Solution 1 2 3 4 5 A365 0.617 0.755 0.920 0.592 0.685 A700 0.0235 0.0714 0.0945 0.0147 0.0540When measured in a 1.00 cm cuvette, a 4.1x10M solution of species X exhibited absorbances of 0.1025 and 0.533 at 530 nm and 325 nm, respectively. A 8.20x10 M solution of species Y gave absorbances of 0.230 and 0.508 at 530 nm and 325 nm, respectively. Both species were dissolved in the same solvent, and the solvent's absorbance was 0.000 and 0.000 at 530 nm and 325 nm, respectively, in a 1 cm cuvette. Calculate the concentrations of X and Y in an unknown solution that yielded absorbance data of 0,683 at 530 nm and 1.351 at 325 nm in a 1.0 cm cuvette A. X= 4.20 X10M Y=3.20 x10+M O B. X1.25 X10M Y= 4.20 x10-5M OCX-3.75X10M Y-1 4x10M OD.X-3.80 x 10 M Y 2.10K10M