For spectrophometric method to be viable, which of the following must be met? a. A high MW complex must be produced in the reaction b. Analyte must have high absorptivity c. Species must emit light d. A complex with intense color must be produced
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For spectrophometric method to be viable, which of the following must be met?
a. A high MW complex must be produced in the reaction
b. Analyte must have high absorptivity
c. Species must emit light
d. A complex with intense color must be produced
Step by step
Solved in 2 steps
- 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 2:12. 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…Co and Ni can be analysed simultaneously by their reaction with 2, 3-quinoxalinedithiol. Molar absorptivity data at the wavelengths are: Co-Complex Ni-Complex Molar Absorptivity.c 510 nm 36400 5520 656 nm 1240 17500 A 0.519 g sample was dissolved and diluted to 50 ml. A 25 ml aliquot was treated to eliminate interferences; after addition of 2, 3-quinoxalinedithiol, the volume was adjusted to 50 ml. this solution had an absorbance of 0.477 at 510 nm and 0.219 at 656 nm in 1.00 cm cell. Calculate the parts per million of Co and Ni in the sample.
- 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 MData Sheet: Investigation of Nickel and Copper Coordination Complexes Part B: The Coordination Number of Ni²* Mass of Ni(NO,),.6H,0_ 2. 3429 Volume of Deionized H,0 45.6 Concentration of Ni²* Solution Moles Ni+ TRIAL # Initial Temperature Final Temperature greaction AH. reaction- 20.50 21.62 22.64 3. 23-58 24.45 4. 24.45 25.25 26.15 25.91 Average Bond Energy Coordination Number of Ni+Data Sheet: Investigation of Nickel and Copper Coordination Complexes Part B: The Coordination Number of Ni* Mass of Ni(NO,)z.6H,O_2. 3429 Volume of Deionized H,O 45.6 Concentration of Ni?+ Solution Moles Ni?+ TRIAL # Initial Temperature Final Temperature greaction AH, reaction- 20.50 22.64 2. 22.64 23,58 3. 23.58 24.45 4. 24.45 5. ○99で 26.15 26.07 25.91 01 88.8 Average Bond Energy Coordination Number of Ni²+
- Consider the fictional transition metal 'Gc' and the complex ions formed with it: [GcI.], [Gc(NH;).]*+, and [Gc(C:O.).]>- If the A of max absorbance for one of the solutions is 450 nm, what are the possible colors for each of the solutions? (A) [GcI]³ could appear yellow, [Gc(NH;).]+ could appear purple, and [Gc(C,O.):]}- could appear blue. (B) [GcI.]- appears purple, [Gc(NH;).]+ could appear yellow, and [Gc(C.O.);]- could appear blue. (C) [GcI6]3- could appear purple, [Gc(NH3)6]3+ could appear yellow, and [Gc(C204)3]3- could appear orange. (D) [GcI6]3- could appear yellow, [Gc(NH3)6]3+ could appear purple, and [Gc(C204)3]3- could appear orange. (E) Not enough infoOne common way to determine Phosphorous in urine is to treat the sample after removing the protein, with molybdenum (VI) and then reduce the 12-molybdophosphate with ascorbic acid to give an intense blue color species called molybdenum blue. The Absorbance of molybdenum blue can be measured at 650 nm. A patient produced 1122 mL of urine in 24 hours. A 1.00 mL aliquot of the sample was treated with Mo(VI) and ascorbic acid and diluted to a volume of 50.00 mL. A calibration plot was prepared by treating 1.00 mL aliquots of Phosphate standard solutions in the same manner as the urine sample. The absorbances of the standards and the urine sample were obtained at 650 nm, and the following results were obtained: Solution absorbace at 650 nm 1.00 ppm P 2.00 ppm P 3.00 ppm P 4.00 ppm P Urine sample 0.230 0.430 0.630 0.840 0.518 (1) Construct a plot of the calibration curve and find the slope, intercept and the number of ppm of P in the sample. (ii) What mass in grams of phosphorous was…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…
- 1.0- stoichiometric mixture 0.8- & 0.6- 0.4- metal in excess 0.2- 0.0- 0.0 0.2 0.4 XL 0.6 0.8 1.0 AAAAAAÄ. From the Job's plot shown, what is ratio of the metal-to-ligand (M:L) ? absorbance ligand in excessA 50.0-mL sample containing Ni21 was treated with 25.0 mL of 0.050 0 M EDTA to complex all the Ni21 and leave excess EDTA in solution. How many millimoles of EDTA are contained in 25.0 mL of 0.050 0 M EDTA?To measure the iron content of runoff from a ranch a 25.0 mL sample of run off was acidified with HNO3 and treated with excess KSCN to form a red complex. (KSCN itself is colorless.) The solution was then diluted to 100 mL and put into a variable pathlenght cell. For comparison, a 10.0 mL reference sample of 6.80 x 10-4 M Fe3+ was treated with HNO3 and KSCN and diluted to 50.0 mL. The reference was placed in a cell with a 1.00 cm pathlenght. The runoff had the same absorbance as the reference when the pathlenght of the runoff cell was 2.48 cm. What wa the concentraton of iron in the runoff?