LabWriteUp2Done - Jazmin Agee Lab Partner Chris Heggenberger Chemistry 112L Lab 2 Write Up A Research Question How much aspirin salicylate acid is

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Jazmin Agee Lab Partner: Chris Heggenberger Chemistry 112L Lab 2 Write Up 2/2/16 A. Research Question How much aspirin, salicylate acid, is present in each aspirin tablet? B. Observations and Results When we weighed out exactly 1.250 grams of aspirin and dissolved in NaOH and ferric nitrate the solution turned a very deep purple color. The Bayer tablet was 500 mg and weighed 0.61 grams. The Excedrin tablet dosage was 250 mg and weighed 0.67 grams. When we dissolved the tablets in NaOH the solution turned a very milky white. Table 1. Absorbance of Aspirin at Different Concentrations Aspirin (g/mL) Absorbance 10 mL 0.684 8 mL 0.687 6 mL 0.655 4 mL 0.516 2 mL 0.367 1 mL 0.270 Table 2. Absorbance, Percent, and Mass of aspirin per name brand tablet. Brand Advertised mass of aspirin per tablet Tablet Mass Absorbance of tablet solution Mass of aspirin per tablet % aspirin per tablet Bayer 500 mg 0.61 g 0.118 0.067 11% Excedrin 250 mg 0.67 g 0.157 0.0897 13%
0 0 0 0 0 0 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 f(x) = 8748.42x R² = 0.92 Absorbance vs. Concentration of Aspirin Solution Concentration of Aspirn Absorbance 0 0 0 0 0 0 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 f(x) = 8741.15x