chem 3031 (1&2)

chem 3031 (1&2) - Mafutaga Taase OCHEM 3031 Sept. 27,...

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Mafutaga Ta’ase OCHEM 3031 Sept. 27, 2010 Introduction to Microscale Laboratory A/ Automatic Pipet - Weigh a 3-ml conical vial with screw cap and Teflon insert, accurately - Use automatic pipet, dispense 0.500 mL of H 2 O in vial - Weigh it second time with cap assembly - Determine weight of H 2 O dispensed - Calculate density of H 2 O from results - Repeat experiment using 0.500 mL of Hexane - Record results in notebook - Compare theoretical values with experimented values C/ Graduated Pipet - Weigh a 3-mL conical vial with screw cap and Teflon insert, accurately - Use 1.0-mL graduated pipet, dispense 0.50-mL H 2 O into vial - Weigh it second time after replacing cap assembly - Determine weight of H 2 O dispensed - Calculate density of H 2 O from results - Repeat experiment using 0.50 mL of Hexane - Record results in notebook - Compare theoretical values with experimented values
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Experiment 8 Acetylsalicylic Acid Preparation of Acetylsalicylic Acid (Aspirin) - Prepare hot water bath with 250-mL beaker and hot plate - Use 100 mL H 2 O and adjust temperature to about 50 0 C - Weigh 0.210 g of salicylic acid and place in dry 5-mL conical vial - Record actual weight - Use automatic pipet or dispensing pump to add 0.480 mL acetic anhydride - Add one drop of concentrated phosphoric acid using Pasteur pipet in mixture - Add magnetic spin vane and attach air condenser to the vial - Clamp assembly so that vial is partially submerged in hot water bath - Stir mixture with spin vane until salicylic acid dissolves - Heat mixture for 8-10 minutes after solid dissolves to complete reaction Crystallization of Acetylsalicylic Acid
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chem 3031 (1&2) - Mafutaga Taase OCHEM 3031 Sept. 27,...

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