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If 2.0 mL of distilled water is added to 3.0 mL of a 0.150 M solution...
2. (you don't Show using Hess's Law how the enthalpy of reaction for HCL + NaOH...
2. (you don't Show using Hess's Law how the enthalpy of reaction for HCL + NaOH need specific numbers, just call it AH) minus the enthalpy of reaction for HCheg) + NH ) (call it AH.) should be equal to the enthalpy of reaction for NaOH2 + NH Cla). Show all work. with a concentration of 0.160 M has an absorbance of 0.80 in a 1.0 cm path length cuvette. (a) What would be the absorbance expected if the sample...
b) Write a statement of Lambert's Law. If 2.0 mL of distilled water is added to...
b) Write a statement of Lambert's Law. If 2.0 mL of distilled water is added to 3.0 mL of a 0.150 M solution of Cocl, what is the concentration of the resulting solution? Show your work.
An unknown Fe(II) sample is added to 2.50 mL of a 0.0300 M potassium dichromate solution...
An unknown Fe(II) sample is added to 2.50 mL of a 0.0300 M
potassium dichromate solution (in acidic medium) in a 25 mL
volumetric flask. 2 M H2SO4 is added to fill the flask to the
calibration mark. After the reaction proceeds to completion, the
absorbance of the solution at 447 nm is measured to be 0.550 using
a 1.00 cm path length. Calculate the following and enter your
answers with correct significant figures.
A) Molarity of Cr2O7 in the...
Tips for Lab Discussion • Discuss calibration curve and slope determined. Discuss concentration of copper found....
Tips for Lab Discussion • Discuss calibration curve and slope determined. Discuss concentration of copper found. Discuss percent of copper in brass sample calculated. Discuss sources of success or error encountered during the experiment Practice Problems 1- Why is a calibration curve constructed? 2- If you used a dirty cuvette when reading when the calibration curve, would this raise or lower the value of the slope? Explain. 3- If unknown to the student, the standard CuSO4.5H2O solution was prepared using...
1. A student makes a solution by mixing 7.0 mL of a 4.5 x 10 M...
1. A student makes a solution by mixing 7.0 mL of a 4.5 x 10 M solution of Allura Red and 3.0 ml of water. What is the concentration of Allura Red in the resulting solution? A student is interested in the concentration of blue dve in his favorite beverage. He knows that spectroscopy can be used to determine the concentration of dye molecules in a solution. After making several solutions of known concentration, the student measured the absorbance of...
You diluted a 12.96 ml vinegar sample into a 100 ml volumetric flask with distilled water....
You diluted a 12.96 ml vinegar sample into a 100 ml volumetric flask with distilled water. You titrated a 25.00 mL aliquot of that solution and determined the concentration of acetic acid to 0.048 M. What was the concentration of acetic in the original sample.
Please I need Answers for ALL THESE QUESTIONS with explanation 2 A solution containing 52.4 mg/100ml...
Please I need Answers for ALL THESE QUESTIONS with
explanation
2 A solution containing 52.4 mg/100ml of B (335 g/mole) has a transmittance of 45.2% in a 1.0 cm cell at 400nm. Calculate the "ABSORPTIVITY" of "B" at this wavelength Inna m L v inole -,.С/.x103 i-moll A Iron is treated with excess color 3.A 2.5ml aliquot of a solution containing 7.9ppm reagent to give a colored "Complex-product"; this was then diluted to 50ml with buffer. is 7,000 L/Mol/cm、.rm /つのフ...
1. Use the following data to construct a calibration curve and determine the concentration of unknown...
1. Use the following data to construct a calibration curve and determine the concentration of unknown as given. What is the molar absorptivity of the analyte? The compound solutions were measured in a 0.5 cm path length quartz cuvette. solution [X] (M) Absorbance At 254 nm Standard 1 Standard 2 Standard 3 Standard 4 Standard 5 Sample 0.03584 0.05719 0.1289 0.2305 0.3161 ??? 0.097 0.169 0.365 0.682 0.997 0.719
A Bill' external standard curve built from absorbance signal vs. analyte concentration (in uM) has the...
A Bill' external standard curve built from absorbance signal vs. analyte concentration (in uM) has the following calibration curve equation y = 0.0500 x + 0.003. If a sample produced an absorbance of 0.300, what was the Bi concentration in the solution in the cuvette? A. 0.015 mM B. 6.00 mm c. 5.94 mm D. 0.600 mm Reset Selection estion 4 of 5 2 Points If the concentration of Bi in a diluted sample (after dilution of the original sample)...
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...
2. (you don't Show using Hess's Law how the enthalpy of reaction for HCL + NaOH need specific numbers, just call it AH) minus the enthalpy of reaction for HCheg) + NH ) (call it AH.) should be equal to the enthalpy of reaction for NaOH2 + NH Cla). Show all work. with a concentration of 0.160 M has an absorbance of 0.80 in a 1.0 cm path length cuvette. (a) What would be the absorbance expected if the sample...
b) Write a statement of Lambert's Law. If 2.0 mL of distilled water is added to 3.0 mL of a 0.150 M solution of Cocl, what is the concentration of the resulting solution? Show your work.
An unknown Fe(II) sample is added to 2.50 mL of a 0.0300 M
potassium dichromate solution (in acidic medium) in a 25 mL
volumetric flask. 2 M H2SO4 is added to fill the flask to the
calibration mark. After the reaction proceeds to completion, the
absorbance of the solution at 447 nm is measured to be 0.550 using
a 1.00 cm path length. Calculate the following and enter your
answers with correct significant figures.
A) Molarity of Cr2O7 in the...
Tips for Lab Discussion • Discuss calibration curve and slope determined. Discuss concentration of copper found. Discuss percent of copper in brass sample calculated. Discuss sources of success or error encountered during the experiment Practice Problems 1- Why is a calibration curve constructed? 2- If you used a dirty cuvette when reading when the calibration curve, would this raise or lower the value of the slope? Explain. 3- If unknown to the student, the standard CuSO4.5H2O solution was prepared using...
1. A student makes a solution by mixing 7.0 mL of a 4.5 x 10 M solution of Allura Red and 3.0 ml of water. What is the concentration of Allura Red in the resulting solution? A student is interested in the concentration of blue dve in his favorite beverage. He knows that spectroscopy can be used to determine the concentration of dye molecules in a solution. After making several solutions of known concentration, the student measured the absorbance of...
Please I need Answers for ALL THESE QUESTIONS with
explanation
2 A solution containing 52.4 mg/100ml of B (335 g/mole) has a transmittance of 45.2% in a 1.0 cm cell at 400nm. Calculate the "ABSORPTIVITY" of "B" at this wavelength Inna m L v inole -,.С/.x103 i-moll A Iron is treated with excess color 3.A 2.5ml aliquot of a solution containing 7.9ppm reagent to give a colored "Complex-product"; this was then diluted to 50ml with buffer. is 7,000 L/Mol/cm、.rm /つのフ...
1. Use the following data to construct a calibration curve and determine the concentration of unknown as given. What is the molar absorptivity of the analyte? The compound solutions were measured in a 0.5 cm path length quartz cuvette. solution [X] (M) Absorbance At 254 nm Standard 1 Standard 2 Standard 3 Standard 4 Standard 5 Sample 0.03584 0.05719 0.1289 0.2305 0.3161 ??? 0.097 0.169 0.365 0.682 0.997 0.719
A Bill' external standard curve built from absorbance signal vs. analyte concentration (in uM) has the following calibration curve equation y = 0.0500 x + 0.003. If a sample produced an absorbance of 0.300, what was the Bi concentration in the solution in the cuvette? A. 0.015 mM B. 6.00 mm c. 5.94 mm D. 0.600 mm Reset Selection estion 4 of 5 2 Points If the concentration of Bi in a diluted sample (after dilution of the original sample)...
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...
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