2. The absorbance of each standard was measured using a UV-Vis spectrophotometer and the results areas follows:Volumetric FlasksAbsorbance11.50121.0340.50240.25650.10360.013blank0.0013. The concentration of synthesized aspirin was determined by dissolving 0.1g in 2.5 mL ethanol using a25-ml volumetric flask and added with Iron (III) chloride. The solution was diluted with distilled water up to25mL. 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 stocksolution 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) chloridewas added to each 25 mL volumetric flasks, and diluted to mark with distilled water)Aspirin stock solutionadded, mLVolumetric Flask(s)Ethanol added, mLConcentration, moles/L11.51.021.01.530.52.040.252.2550.102.4060.012.49blank2.50

The expression of dilution law is shown below: C1V1 = C2V2 where; C1 = concentration of known…

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

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter4: Types Of Chemical Reactions And Solution Stoichiometry

Section: Chapter Questions

Problem 47E

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