an ester either with the hydroxyl or with the acid. In the presence of acetic anhydride‚ acetylsalicylic acid (aspirin or ASA) is formed. Correspondingly‚ an excess of methanol will form methyl salicylate‚ which is also an analgesic. In this experiment‚ we shall use the former reaction to prepare aspirin. Salicylic acid will not react significantly with acetic acid to produce aspirin. Acetic acid anhydride‚ however‚ is more reactive than acetic acid because the acetoxy group (-O2CCH3)
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Starting Material Appearance: white powder Molar Mass: 138.12 g/mol Melting Point: 1590C Boiling Point: 2110C Density: 1.44 g/cm3 Mildly irritating (pulmonary irritants). Harmful by inhalation‚ ingestion and through skin absorption. Acetic Anhydride Starting‚ Material‚ serves also as the solvent colorless liquid with a smell of acetic acid Molar Mass: 102.09 g/mol Melting Point: -73.1 0C Boiling Point: 139.8 0C Density: 1.082g/cm3 Corrosive Flammable and Lachrymator which makes eyes
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a healing food‚ it can help you to prevent sicknesses‚ as cough. Chocolate can prevent sicknesses. One study showed that 300 mg of theobromine was effective in preventing a cough… The Hershey Company estimates that a 43 gram Hershey’s milk chocolate bar contains 9 mg of caffeine and 64 mg of theobromine. One teaspoon of their chocolate syrup contains 5 mg caffeine and 64 mg theobromine. (John Bottrell‚ The Effects of Chocolate on Asthma (or reasons to consume chocolate). The theobromine is a substance
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Experiment No. 1: MELTING POINT AND BOILING POINTS OF ORGANIC COMPOUNDS ABSTRACT The properties of organic compounds depend on their chemical structures. Intermolecular forces of attraction affect physical properties such as melting and boiling point. Through the Thomas Hoover apparatus‚ the melting point of 8 test compounds was determined. Salicylic acid exhibited the highest melting point while naphthalene‚ the lowest. The stronger the intermolecular forces of attraction‚ the higher the melting
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University of Santo Tomas Abstract Recrystallization is a technique used to purify organic solids. This method involves dissolving of a solute in a solvent and inciting the solute to produce a precipitate from a solution. In this experiment‚ acetic anhydride was added to the mixture of 2mL aniline and 20mL of distilled water. The mixture was cooled in an ice bath and filtered through filter paper resulting to the crude acetanilide. The pure acetanilide was then produced by the filtered solution of crude
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which is also known as acetylsalicylic acid. C9H8O4 is the chemical format for Asprin. The chemical structure of aspirin: Aspirin is anti-inflammatory. Aspirin is prepared by chemical synthesis from salicylic acid‚ by acetylation with acetic anhydride. The fact that it is an acid allows us to quantify the amount of aspirin in a solution. We would do this by by using an acid-base titration. Sodium hydroxide (NaOH) will be used In this experiment as the base. Preparation • Lab coats should be fully
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of the aspirin sample‚ which will in turn indicate the purity of the sample. The last is conducting a colorimetric analysis on the aspirin sample. The educational goals of this lab are to find the structural formulas for salicylic acid‚ acetic anhydride‚ and aspirin and to use these structural formulas to construct a reaction equation by describing the synthesis of aspirin. In addition‚ you have to be able to use your percent purity calculations to determine the percent yield of your synthesis of
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varnish. In this work efforts were made to substitute phenol from tannins extracted from the stem bark of Khaya senegalensis to produce wood vanish and assessed its quality. An extract with a Stiasny Number of 87.88 % and extractable phenols of 2.82 mg/kg was used to synthesize a phenol-formaldehyde called tannin-formaldeyde. Properties of this resin were compared with that of phenol-formaldehyde resin synthesized using a commercially available phenol following the same procedure. A yield of 89
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Materials Chemicals Equipment Safety Containers Measuring Devices Other Equipment Procedure Synthesis of Aspirin Crystalizing the Aspirin Recrystallizing the Crude Aspirin Finding the Melting Point Range Safety Precautions Acetic Anhydride Sulphuric and Salicylic Acid Heating Observations Mass of Aspirin Synthesized Melting Point Calculations Percentage Yield Maximum Yield Crude Product Final Product Melting Range Percentage Error Crude Product Final Product Conclusion
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Quitno 1 Crisel Joy Quinto Nutrition 313: Contemporary Nutrition Kelly Lane November 26‚ 2014 Diet Analysis Based on a 24 Hour Recall of my diet‚ results using NutriCalc Plus report that my food intake lacked a healthy balance of all food groups. My Grain intake reached only 60% of the My Plate daily recommendations. My Vegetable intake was a mere 50% of the recommended servings. Additionally‚ I consumed 84% of the daily recommendations for the Dairy Group. Nonetheless‚ I did exceed the recommendations
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