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You prepared standard benzoic acid and caffeine solutions that allowed you to produce four standard curves...
A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then...
A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.239 in a 1.00 cm cuvette. A 0.149 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to...
You prepared four standard solutions by serial dilutions that contained decreasing concentrations of bromocresol green, but...
You prepared four standard solutions by serial dilutions that contained decreasing concentrations of bromocresol green, but constant HCl concentration. You also prepared four additional standard solutions by serial dilutions that contained decreasing concentrations of bromocresol green, but constant NaOH concentration. You then measured the absorbances of these solutions at their respective lamba max wavelengths (AX1 & A2). These absorbances were plotted versus Hin and In molar concentrations respecti vely to produce linear calibration curves with linear equations shown below. AX1...
need help on these Suppose you obtained the following data from two standard solutions of known...
need help on these
Suppose you obtained the following data from two standard solutions of known concentrations using a UV-Vis spectroscope: Analysis # Conc. (mg/L) 8.00 20.00 Absorbance (at 255 nm) 0.160 0.390 What is the concentration (in mg/L) of an unknown solution with an absorbance of 0.200 at 255 nm 10 points)? The unknown solution contains the same analyte as the standard solution does (Assume a path length of 1cm). 10. You prepared a stock solution by dissolving a...
5. Caffeine in Mountain Due is determined by standard addition method. Five mL of the soft...
5. Caffeine in Mountain Due is determined by standard addition method. Five mL of the soft drink is placed in each of five 100-mL volumetric flask. Then, increasing volumes: 0, 5, 10, 15, 20 mL of a standard solution of 0.300 mM caffeine are added to each flask. All 5 flasks are filled with distilled water to the 100-mL mark and mixed well. Absorbance of - the solution in each flask is obtained. Plotting absorbance vs added volume (as mL)...
A standard solution of iron was made by weighing 0.075 g of Fe(NH4)2(SO4)2 6(H2O) in 250...
A standard solution of iron was made by weighing 0.075 g of Fe(NH4)2(SO4)2 6(H2O) in 250 mL. Aliquots of this standard solution (see below) were transferred to a 100 mL volumetric flask, pH adjusted with citrate, and reacted with hydroquinone and o-phenanthroline and diluted to volume (100 mL). The absorbance was measured in a 1.0-cm cell using a Genesys 20 Spectrophotometer at 508 nm: Aliquot of standard solution Absorbance 1.0 mL 0.079 2.0 mL 0.163 5.0 mL 0.413 10.0 mL...
You prepared a set of standard solutions by serial dilutions. You started with a stock solution...
You prepared a set of standard solutions by serial dilutions. You started with a stock solution of bromocresol green with a concentration of 0.213 M. The following standard solutions were prepared as described below. Solution A: Stock solution of bromocresol green at a concentration of 0.213 M. Solution B: 25 mL of solution A was diluted to 50 mL in a volumetric flask. Solution C: 25 mL of solution B was diluted to 50 mL in a volumetric flask. Solution...
Part C. Quantitative Spectroscopy Wavelength(A) Absorbance Amax-10 Amax 10 Wavelength used for Analysis in Part C:...
Part C. Quantitative Spectroscopy Wavelength(A) Absorbance Amax-10 Amax 10 Wavelength used for Analysis in Part C: Solution Concentration Absorbance % Transmittance Standard 1 Standard 2 Standard 3 Standard 4 Unknown 0.20 M Show an example calculation obtaining the molarity of the standards. a. Copper Standard 2: Obtain additional 0.20 M CuSO4 solution from the tray. Pipet 10 mL of 0.20 M CuSO4 solution into a 50 mL Erlenmeyer flask. Pipet 10 mL of DI water into the same tube and...
A student prepares a caffeine standard solution that has a concentration of 1858 ppm. To prepare...
A student prepares a caffeine standard solution that has a concentration of 1858 ppm. To prepare a calibration curve, the student pipets various volumes of the standard solution into 50.0 mL volumetric flasks and dilutes to the fill line with water. The absorbance of each solution is measured in a 1.00 cm cuvette using the spectrophotometer and is shown in the table below. Calculate the concentration of each solution and create a calibration curve using the absorbance data provided. Based...
14. The unknown tablet is prepared for analysis in two steps. The tablet is crushed into...
14. The unknown tablet is prepared for analysis in two steps. The tablet is crushed into a powder and then dissolved into a 250 ml volumetric flask with dilute acetic acid. A duted powder solution is prepared by transferring 25.00 mL of the original powder solution into a so me volumetric ask and duting to volume with dute acetic acid Then 1.00 mL of the diluted powder solution is added to each of the standard addition flasks each flask has...
question one question two Aspirin lab (10 points) 5. a) Spectroscopy is being used to determine...
question one
question two
Aspirin lab (10 points) 5. a) Spectroscopy is being used to determine the concentration of aspirin in an unknown sample. The absorbance spectrum of the highest concentration standard [Fe3+, SA) prepared is given below. What wavelength should be used to create the calibration curve for the experiment? Explain your reasoning. 0.14 Absorbance 0.02 250 300 450 500 350 400 Wavelength (nm) Wavelength Explain your reason briefly. b) In this experiment an aspirin tablet was placed in...
A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.239 in a 1.00 cm cuvette. A 0.149 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to...
You prepared four standard solutions by serial dilutions that contained decreasing concentrations of bromocresol green, but constant HCl concentration. You also prepared four additional standard solutions by serial dilutions that contained decreasing concentrations of bromocresol green, but constant NaOH concentration. You then measured the absorbances of these solutions at their respective lamba max wavelengths (AX1 & A2). These absorbances were plotted versus Hin and In molar concentrations respecti vely to produce linear calibration curves with linear equations shown below. AX1...
need help on these
Suppose you obtained the following data from two standard solutions of known concentrations using a UV-Vis spectroscope: Analysis # Conc. (mg/L) 8.00 20.00 Absorbance (at 255 nm) 0.160 0.390 What is the concentration (in mg/L) of an unknown solution with an absorbance of 0.200 at 255 nm 10 points)? The unknown solution contains the same analyte as the standard solution does (Assume a path length of 1cm). 10. You prepared a stock solution by dissolving a...
5. Caffeine in Mountain Due is determined by standard addition method. Five mL of the soft drink is placed in each of five 100-mL volumetric flask. Then, increasing volumes: 0, 5, 10, 15, 20 mL of a standard solution of 0.300 mM caffeine are added to each flask. All 5 flasks are filled with distilled water to the 100-mL mark and mixed well. Absorbance of - the solution in each flask is obtained. Plotting absorbance vs added volume (as mL)...
You prepared a set of standard solutions by serial dilutions. You started with a stock solution of bromocresol green with a concentration of 0.213 M. The following standard solutions were prepared as described below. Solution A: Stock solution of bromocresol green at a concentration of 0.213 M. Solution B: 25 mL of solution A was diluted to 50 mL in a volumetric flask. Solution C: 25 mL of solution B was diluted to 50 mL in a volumetric flask. Solution...
Part C. Quantitative Spectroscopy Wavelength(A) Absorbance Amax-10 Amax 10 Wavelength used for Analysis in Part C: Solution Concentration Absorbance % Transmittance Standard 1 Standard 2 Standard 3 Standard 4 Unknown 0.20 M Show an example calculation obtaining the molarity of the standards. a. Copper Standard 2: Obtain additional 0.20 M CuSO4 solution from the tray. Pipet 10 mL of 0.20 M CuSO4 solution into a 50 mL Erlenmeyer flask. Pipet 10 mL of DI water into the same tube and...
14. The unknown tablet is prepared for analysis in two steps. The tablet is crushed into a powder and then dissolved into a 250 ml volumetric flask with dilute acetic acid. A duted powder solution is prepared by transferring 25.00 mL of the original powder solution into a so me volumetric ask and duting to volume with dute acetic acid Then 1.00 mL of the diluted powder solution is added to each of the standard addition flasks each flask has...
question one
question two
Aspirin lab (10 points) 5. a) Spectroscopy is being used to determine the concentration of aspirin in an unknown sample. The absorbance spectrum of the highest concentration standard [Fe3+, SA) prepared is given below. What wavelength should be used to create the calibration curve for the experiment? Explain your reasoning. 0.14 Absorbance 0.02 250 300 450 500 350 400 Wavelength (nm) Wavelength Explain your reason briefly. b) In this experiment an aspirin tablet was placed in...
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dissolves solid iron according to the followiaung reaction:
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