Determination of Aspirin in TabletsChemistry 112L, Section 001September 17, 2014A.Research QuestionWhat is the relationship between the concentration of aspirin and the absorbency of the solution?B.Observations & ResultsTablesTable 1. Molar Absorptivity of Aspirin: Concentration vs. AbsorbanceAspirin (g/mL)Absorbance (au)0.00 g/mL0.000 au0.0000100 g/mL0.129 au0.0000200 g/mL0.219 au0.0000400 g/mL0.361 au0.0000600 g/mL0.513 au 0.0000800 g/mL0.773 au0.000100 g/mL1.169 auTable 2. Aspirin Tablet DataBrandAdvertised % aspirin (from bottle)Tablet mass (g)Abs of analyzed tablet solutionMass of aspirin per tablet (g)% aspirin per tablet (from analysis)Bayer82.9 %0.392 g0.806 au0.177 g45.2 %Kroger86.7 %0.375 g0.368 au0.388 g103%Graphs
000000000.20.40.60.811.21.4f(x) = 10390.39xR² = 0.99Molar Absorptivity of Aspirin: Absorbance vs. ConcentrationConcentration (g/mL)Absorbance (au)CalculationsAspirin concentration calculations are written on the attached notebook paper.Advertised % of aspirin per tablet:Bayer: 0.325 g / 0.392 g = 0.8290816… = 0.829 *100 = 82.9 % aspirin by massKroger: 0.325 g / 0.375 g = 0.8666666… = 0.867 * 100 = 86.7 % aspirin by massMass of aspirin per tablet, and percent of aspirin per tablet are calculated in the analysis.
