Determination of Aspirin Lab Write-up

Determination of Aspirin Lab Write-up - Determination of...

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Determination of Aspirin in Tablets Chemistry 112L, Section 001 September 17, 2014 A. Research Question What is the relationship between the concentration of aspirin and the absorbency of the solution? B. Observations & Results Tables Table 1. Molar Absorptivity of Aspirin: Concentration vs. Absorbance Aspirin (g/mL) Absorbance (au) 0.00 g/mL 0.000 au 0.0000100 g/mL 0.129 au 0.0000200 g/mL 0.219 au 0.0000400 g/mL 0.361 au 0.0000600 g/mL 0.513 au 0.0000800 g/mL 0.773 au 0.000100 g/mL 1.169 au Table 2. Aspirin Tablet Data Brand Advertised % aspirin (from bottle) Tablet mass (g) Abs of analyzed tablet solution Mass of aspirin per tablet (g) % aspirin per tablet (from analysis) Bayer 82.9 % 0.392 g 0.806 au 0.177 g 45.2 % Kroger 86.7 % 0.375 g 0.368 au 0.388 g 103% Graphs
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0 0 0 0 0 0 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 f(x) = 10390.39x R² = 0.99 Molar Absorptivity of Aspirin: Absorbance vs. Concentration Concentration (g/mL) Absorbance (au) Calculations Aspirin concentration calculations are written on the attached notebook paper. Advertised % of aspirin per tablet: Bayer: 0.325 g / 0.392 g = 0.829 0816… = 0.829 *100 = 82.9 % aspirin by mass Kroger: 0.325 g / 0.375 g = 0.866 6666… = 0.867 * 100 = 86.7 % aspirin by mass Mass of aspirin per tablet, and percent of aspirin per tablet are calculated in the analysis.
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