Ex .6 Spectrophotometric Analysis of a Commercial Aspirin TabletA) Standard solution and Beers law calibration curve1-Fill in the following table :Concentarion For S.1 Me x Ve Max V₁0.000325 x 1.0ml - Ma x 10.0mlSolutionS. 1S.2S.3S.4ASA of unknown2- Plot a graph of Absorbance vs. concmol/Labsorbance1.61.41.210.80.60.40.20Absorbance02Absorbance vs. Cocentration4B) Analysis of unknown aspirin tablet1.Mass of aspirin tablet=2.Concentration of ASA unknown from calibration curvegConcentration?????????63. .Conc of Stock ASA unknown = 50 ml / 1.5 ml (D.F) x Conc of ASAunknown=.....mol/L4. Moles of ASA in 100 ml solution - Concof Stock ASA unknownx 0.1 L =5.Mass of ASA = moles ASA x Molar Mass ASA (180 g/mol) =6.% of ASA in aspirin - Mass of ASA/ Mass of aspirin tablet x100 =8mol/Lg10conc. mol/Lx 104molesOY-Values% Group.3SolutionS. 1S.2S.3S.4ASA of unknown solutionMass of aspirin tabletConcentration Absorbance(M)0.72 x 102.54 x 10-4-44.71 x 1046.52 x 10-4(from graph)????0.1493g0.200.420.650.750.32

First, we have to draw the absorbance versus concentration(M) plot. From the linear regression…

B) Analysis of unknown aspirin tablet 1.Mass of aspirin tablet= 2.Concentration of ASA unknown from calibration curve = 3. .Conc of Stock ASA unknown = 50 ml / 1.5 ml (D.F) x Conc of ASA unknown=..... ...... mol/L 4. Moles of ASA in 100 ml solution = Concof Stock ASA unknownx 0.1 L = 5.Mass of ASA = moles ASA x Molar Mass ASA (180 g/mol) = 6.% of ASA in aspirin = Mass of ASA/ Mass of aspirin tablet x100 = mol/L ........... moles g .%

B) Analysis of unknown aspirin tablet 1.Mass of aspirin tablet= 2.Concentration of ASA unknown from calibration curve = 3. .Conc of Stock ASA unknown = 50 ml / 1.5 ml (D.F) x Conc of ASA unknown=..... ...... mol/L 4. Moles of ASA in 100 ml solution = Concof Stock ASA unknownx 0.1 L = 5.Mass of ASA = moles ASA x Molar Mass ASA (180 g/mol) = 6.% of ASA in aspirin = Mass of ASA/ Mass of aspirin tablet x100 = mol/L ........... moles g .%

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter27: Molecular Fluorescence Spectroscopy

Section: Chapter Questions

Problem 27.11QAP

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