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Suggest an experimental procedure for the determination of copper and zinc in tissue samples with AAS.
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- One 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…Why is it necessary to buffer a solution with sodium acetate in spectrophotometric determination of iron in FASA 25.00 mL aliquot of a solution containing Cu2+ and Fe3+ was titrated with 17.08 mL of 0.05095 M EDTA. A second 25.00 mL aliquot of the Cu/Fe mixture was treated with NaF to form a stable iron-fluoride complex. This mixture was then titrated with EDTA and the endpoint volume was found to be 5.47 mL. Calculate the amounts of Cu2+ and Fe3+ in mg/L. Molar mass (g/mol): Fe = 55.85 and Cu = 63.55
- A calibration curve for the colorimetric determination of phosphorous in urine is prepared by reacting standard solutions of phosphate with molybdenum(VI) and reducing phosphomolybdic acid complex to produce the characteristic blue color. The absorbance (A) is plotted against the concentration of phosphorous. From the following data, determine the linear least-squares straight line and calculate the concentration of phosphorous in the urine sample. Phosphorous (ppm) 1.00 2.00 3.00 4.00 Unknown urine sample Fluorescence intensity 0.205 0.410 0.615 0.820 0.625Consider the titration of Fe21 with Ce41. (a) Write a balanced titration reaction. (b) Write two half-reactions for the indicator electrode. (c) Write two Nernst equations for the cell voltage. (d) Calculate E at the following volumes of Ce41: 10.0, 25.0, 49.0, 50.0, 51.0, 60.0, and 100.0 mL.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.
- To find the copper content in 50 mL of sample, a titration is carried out with 0.01 M AEDT. A selective Cu electrode is used to determine the end point of the titration. Three assessments are performed that use 12.5 mL, 12.3 mL; 12.4 mL of 0.01 M EDTA.a) Indicate the equipment and material necessary to carry out the potentiometric assessment.b) Indicate the reagent that must be added to the sample for the correct performance of the titration. explain the reason.c) Calculate the Cu concentration of the sample (in mg/L).Data: atomic weight Cu = 63.5(1) What is Chelate Effect? Draw the Structure of EDTA?.(i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCl?(ii) What type of stoichiometric defect is shown by NaCl?