Discussionexp7 - James Riddle Jr39592 Experiment 7...

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James Riddle Jr39592 Experiment 7 – Synthesis and Analysis of Aspirin Desai, K The first two objectives were to synthesize a sample of acetylsalicylic acid (aspirin) and then conduct a spectrophotometric analysis of the aspirin sample. Two more objectives included learning Beer’s Law and how to graphically determine the absorption coefficient of Beer’s Law from the calibration curve. The last two objectives were how to determine the percent purity and percent yield of the aspirin synthesis. (1) Acetic anhydride reacts with salicylic acid in the presence of phosphoric acid as a catalyst to create acetylsalicylic acid and acetic acid as products. The reaction of the hydrogen in the hydroxyl group on the salicylic acid molecule with an acetyl group on the acetic anhydride molecule is the driving force behind this chemical process. The freezing point of acetylsalicylic acid is below room temperature. In order for the aspirin to become crystallized, it needed to be cooled. A Buchner funnel was set up to vacuum suction the crystallized sample with washings of cold distilled water in between turning the suction on and off. (2) The mass of the aspirin synthesized was 1.5157 g and the impurity found in the sample was the salicylic acid. (3)
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Discussionexp7 - James Riddle Jr39592 Experiment 7...

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