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Spectrophotometric Analysis of Commercial Aspirin II. The goal for this lab was to determine the percentage of a commercial aspirin by a series of calculations, generated graphs, and experiments. The percent of aspirin in the commercial tablet was found to be 92.3%. This was found using Beer’s Law, the absorbance that was measured using a spectronic 20 and calculated concentrations. A series of experiments by diluting using FeCl₃ was used to find the absorbance which could then be used to generate a linear graph to find the goal by means of absorbance versus concentration. This graph produces an equation; y = 1589.2x + 0.245 that then can by used to find the concentration of aspirin in diluted solution, this then allows us to find the concentration of the commercial aspirin which is used to find moles then further used to find the mass of aspirin in sample; which was found to be 0.1478. This was divided by the mass in grams and multiplied by 100 which produced the 92.3% of aspirin in the commercial tablet.