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1. A stock solution of aspirin was prepared by dissolving 0.05 g in 25 mL ethanol. The prepared stock solution was used to prepare calibration curve as follows: Table 1: Preparation of different standards from stock solution (Note: 2.5 mL of 0.025 M Iron (III) chloride was added to each 25 mL volumetric flasks, and diluted to mark with distilled water) Aspirin stock solution added, mL Volumetric Flask(s) Ethanol added, mL Concentration, moles/L 1 1.5 |1.0 2 1.0 1.5 0.5 2.0 0.25 2.25 0.10 2.40 6 0.01 2.49 blank 2.50

1. A stock solution of aspirin was prepared by dissolving 0.05 g in 25 mL ethanol. The prepared stock solution was used to prepare calibration curve as follows: Table 1: Preparation of different standards from stock solution (Note: 2.5 mL of 0.025 M Iron (III) chloride was added to each 25 mL volumetric flasks, and diluted to mark with distilled water) Aspirin stock solution added, mL Volumetric Flask(s) Ethanol added, mL Concentration, moles/L 1 1.5 |1.0 2 1.0 1.5 0.5 2.0 0.25 2.25 0.10 2.40 6 0.01 2.49 blank 2.50

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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2. The absorbance of each standard was measured using a UV-Vis spectrophotometer and the results are as follows: Volumetric Flasks Absorbance 1 1.501 2 1.034 0.502 4 0.256 5 0.103 6 0.013 blank 0.001 3. The concentration of synthesized aspirin was determined by dissolving 0.1g in 2.5 mL ethanol using a 25-ml volumetric flask and added with Iron (III) chloride. The solution was diluted with distilled water up to 25mL. The absorbance of the synthesized aspirin was 0.678 using UV-Vis spectrophotometer. a. Determine the concentration in moles/L of each standard solution from Table 1. b. Generate a calibration curve by plotting the absorbance vs concentration of standard aspirin solution. Determine the equation of the line (calibration curve). c. Using the calibration curve, determine the percentage purity of the original sample.
Transcribed Image Text:2. The absorbance of each standard was measured using a UV-Vis spectrophotometer and the results are as follows: Volumetric Flasks Absorbance 1 1.501 2 1.034 0.502 4 0.256 5 0.103 6 0.013 blank 0.001 3. The concentration of synthesized aspirin was determined by dissolving 0.1g in 2.5 mL ethanol using a 25-ml volumetric flask and added with Iron (III) chloride. The solution was diluted with distilled water up to 25mL. The absorbance of the synthesized aspirin was 0.678 using UV-Vis spectrophotometer. a. Determine the concentration in moles/L of each standard solution from Table 1. b. Generate a calibration curve by plotting the absorbance vs concentration of standard aspirin solution. Determine the equation of the line (calibration curve). c. Using the calibration curve, determine the percentage purity of the original sample.
1. A stock solution of aspirin was prepared by dissolving 0.05 g in 25 mL ethanol. The prepared stock solution was used to prepare calibration curve as follows: Table 1: Preparation of different standards from stock solution (Note: 2.5 mL of 0.025 M Iron (III) chloride was added to each 25 mL volumetric flasks, and diluted to mark with distilled water) Aspirin stock solution added, mL Volumetric Flask(s) Ethanol added, mL Concentration, moles/L 1 1.5 1.0 2 1.0 1.5 3 0.5 2.0 4 0.25 2.25 5 0.10 2.40 6 0.01 2.49 blank 2.50
Transcribed Image Text:1. A stock solution of aspirin was prepared by dissolving 0.05 g in 25 mL ethanol. The prepared stock solution was used to prepare calibration curve as follows: Table 1: Preparation of different standards from stock solution (Note: 2.5 mL of 0.025 M Iron (III) chloride was added to each 25 mL volumetric flasks, and diluted to mark with distilled water) Aspirin stock solution added, mL Volumetric Flask(s) Ethanol added, mL Concentration, moles/L 1 1.5 1.0 2 1.0 1.5 3 0.5 2.0 4 0.25 2.25 5 0.10 2.40 6 0.01 2.49 blank 2.50
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