Sypnopsis In this experiment‚ acetylsalicylic acid was synthesized from the acidification of salicylic acid and acetic anhydride. The objective was to convert a specific amount of salicylic acid into the same amount of aspirin that was high in purity. Furthermore‚ the other objectives were to enable students to conduct the synthesis of aspirin‚ reinforce skills or recrystallisation and the technique of melting point determination. The amount of each compound should be the same because there is
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point of the compound was determined afterwards. The solid yield (neutral component) was purified by recrystallization by using ethanol as the solvent. ~20 mL of ethanol was added to the solid. Water was then added to this solution drop wise until the solution turned cloudy. After that‚ ethanol was added drop wise again until the solution appeared clear again. To faster the recrystallization‚ the solution was put in an ice bath. The yield was then collected by suction filtration. The weight and
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the first step in the lithification process. There are several ways that this can happen. The other two ways that this can happen is through cementation or recrystallization. Cementation is the process in which substances dissolve in pore water precipitates out and forms a matrix in which grains of sediment are joined together. Recrystallization is the process where the formation of new crystalline mineral grains from old ones. (Murck‚ et al.‚ 2008) Types of Sedimentary Rocks When clastic sediment
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Toxic Water Used to destroy acetic anhydride which did not react; precipitates crude aspirin colorless liquid Molar Mass: 18.06 g/mol Melting Point: 0 °C Boiling Point: 100 0C Density: 1.0g/cm3 -------------- Diethyl ether Recrystallization solvent colorless liquid with a sweet‚ characteristic smell Molar Mass: 74.12 g/mol Melting Point: - 116°C Boiling Point: 35 0C Density: 0.7134 g/cm3 Easily ignited‚ Harmful by ingestion‚ inhalation or through skin contact. Petroleum
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combined to form nitronium ion which was then used as an electrophile in the reaction. Crystals that were collected after the formation of the methyl m-Nitrobenzoate were collected by vacuum filtration and the product was isolated and purified by recrystallization. Reaction scheme: Formation of Electrophile: Procedure: The procedure was as is described in “Laboratory Manual for Organic Chemistry 2311”‚ Eighth Edition‚ Jane E. Wissinger‚ Cengage Learning Custom Solutions‚ Mason‚ Ohio‚ 2010‚ pp
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Used | Reagent | | Amount (mL or g) | Benzil | | 1.05g | | Sodium Borohydride | 0.20g | | Ethanol | | 10mL | | 1. Observations: a. When heating mixture of benzil and ethanol‚ dissolved and became yellow. b. Recrystallization occurred during NaBH4‚ appeared as small‚ white foaming bubbles c. Boiled-cloudy yellow color d. Cooling: had a pale yellow clear and white crystals started to appear 2. Description of product: e. Color: white
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this experiment is to use acid-base extraction techniques to separate a mixture of organic compounds based on acidity and/or basicity. After the three compounds are separated we will recover them into their salt forms and then purify them by recrystallization and identify them by their melting points. Procedure: Extraction of Carboxylic Acid A pre-weighed (0.315g) mixture of Carboxylic acid‚ a phenol‚ and neutral substance was placed into a reaction tube (tube 1). tert-Butyl methyl ether (2ml)
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(Maserton‚ p. 15). Because even small amounts of impurities systematically affect observed chemical reactions‚ the first step to determine the identity of an unknown is to purify the substance. One technique often used to purify solids is recrystallization from a selected solvent. Because of the variable solubility of different compounds in various solvents and at various temperatures‚ it is possible to remove impurities by dissolving the unknown and then immediately cooling the solvent. The
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benzene ring in salicylic acid reacts with acetic anhydride to form an ester functional group. The acetylsalicylic acid crystallizes as the solution cools and begins to come out of the solution. The acetylsalicylic acid is further purified through recrystallization with ethyl acetate. MATERIALS USED: Test Tubes Pasteur Pipette Salicylic acid acetic anhydride Sulfuric acid 125 mL Erlenmeyer flask Scale Water Hot water bath Ice Bath Buchner Fünnel 1% Ferric Chloride Ethyl acetate Glass Rod Iodine
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Quiz #1 Attempt 1 Written: Jul 7‚ 2012 9:48 AM - Jul 7‚ 2012 9:50 AM Submission View Your quiz has been submitted successfully. Question 1 1 / 1 point At what time do you have to complete your online prelab assignment to be allowed to participate in the lab? Question options: A week before the lab Day before the lab at 10 pm The morning of lab day at 8 am One hour before the lab Question 2 1 / 1 point Which materials/chemicals belong in the desiccator? Question options: Drying
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