AcidBase Lab - Brittney Brown Brittany Mikhail Acid and...

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Brittney Brown Brittany Mikhail June 18, 2009 Acid and Base Reactions of the Separation of a Pain Reliever Data: Figure 1. The Reactions: Caffeine Aspirin Phenacetin Table 1. Substances used in the experiment and the amounts Substance (1) Amount Unknown Sample A 25 mL 3M HCl 25 mL NaHCO 3 (s) 7.003 g
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0.5M NaHCO 3 25 mL CH 2 Cl 2 25 mL MgSO 4 Until dry Aspirin extracted 0.769 g Caffeine extracted 0.163 g Phenacetin extracted 0.325 g Table 2. Actual and Experimental Melting Points for each Substance Substance Actual Melting Point ( 6,7,8 ) Experimental Melting Point Aspirin 138-140 °C 110-138°C Caffeine 237°C Above 200 °C Phenacetin 134°C 142- Above 200°C Table 3. IR Peaks and their corresponding functional groups for Aspirin Location of Peak (cm -1 ) Functional Group ( 1 ) 1750.08 C=O 1679.04 C=O 2587.44 -OH 1604.95 Arene Table 4. IR Peaks and their corresponding functional groups for Caffeine Location of Peak (cm -1 ) Functional Group ( 1 ) 1692.49 C=O 1641.01 C=O
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2955.79 C-H Table 5. IR Peaks and their corresponding functional groups for Phenacetin Location of Peak (cm -1 ) Functional Group ( 1 ) - N-H - N-H 1690.10 C=O 1643.53 C=O 1605.39 C=C (Arene) Discussion: Extractions are mostly performed for liquid-liquid extractions in which separation is based on the miscibility of the compound ( 2 ). In the lab, the proper technique of extraction was demonstrated by separating an unknown sample. The purpose of this lab
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