Abstract: The purpose of this lab is to synthesise acetylsalicylic acid (aspirin) by creating a reaction between acetic anhydride and salicylic acid. This was be accomplished through the use of recrystallization. Acetic anhydride and salicylic acid are mixed together‚ and then acidified by the addition of a few drops of concentrated sulfuric acid‚ which catalyzed the reaction. The percent yield is calculated to determine the effectiveness of the reaction in preparing the desired product (aspirin)
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Abstract: • Introduction/Objective: Prepare and analyze aspirin from salicylic acid and acetic anhydride‚ and calculate the percent yield of the synthesized aspirin. • Materials and Methods: This experiment called for the synthesis of acetylsalicylic acid‚ or aspirin‚ by using salicylic acid‚ acetic anhydride‚ sulfuric acid‚ and vacuum filtration. The salicylic acid and the acetic anhydride were mixed in a flask. Sulfuric acid was used as a catalyst to speed up the decomposition rate of salicylic
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Biological Science‚ College of Science‚ University of Santo Tomas‚ Manila‚ Philippines Abstract This experiment is conducted to exhibit the synthesis of banana flavoring in the laboratory through the esterification of isoamyl alcohol and acetic anhydride with the use of the Fischer reaction. The set-up used was the reflux modified with a water bath at the constant temperature between 75-80oCelsius. The actual yield that was attained is 0.4271 grams of banana essence. The theoretical yield‚ on the
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of Daphnia is predators‚ algal resources‚ and temperature. 6. It is relevant to understand Daphnia biology because UVR should be considered side by side with predators‚ algal resources and temperature when looking at diel vertical migration. Also‚ wider ranges of lakes such as droughts‚ acidification‚ and modification in land use can change optical characteristics of DOC and therefore increase UVR penetration.
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Aspirin Ling Tecson Gamido‚ Mitchiko Mariel M. Mizukami Abstract Acetylsalicylic acid‚ or also known as aspirin is known to be a drug that relives people of pain and is commonly used even today. It is synthesized from salicylic acid and ethanoic anhydride‚ both of small quantities. Phosphoric acid was used as a catalyst in the synthesis to speed up the process. Esterification is involved and the final product is aspirin with the presence of acetic acid as the byproduct. In order to create the powder
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salicylic acid to acetic anhydride‚ the starting materials. Instead of using acetic acid‚ acetic anhydride was used as solvent since the anhydride reacting with water to form acetic acid tends to drive the reaction to the right. It results from the elimination of a molecule of water from two molecules of acetic acid (see Fig. 11.2). Figure 11.3 below shows the balanced chemical reaction of the synthesis of acetylsalicylic acid. Figure 11.2. Structure of Acetic Anhydride
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anilides‚ such as acetanilide from aniline and acetic anhydride. Acetic anhydride is a so called intermediate chemical within organic synthesis‚ which means a substance intended to create another substance. Acetic anhydride is produced by dehydration of acetic and is used primarily for acetylating of amines‚ alcohols and thiols within both research and industry. Acetynalide is a product of aniline and acetic anhydride reaction. In the result of this to substances we
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ºC) and toluene (bp 110.6 ºC). Analysis via gas chromatography allowed us to determine the relative percentage of hexane and toluene at fractions near the beginning and end of our distillations. Relative percentages have been recorded in the table below‚ and our calculations are shown on page 5. Simple Distillation Retention time (s) Fractional Distillation Retention time (s) Cyclohexane Retention time (s) Toluene Retention time (s) Cyclohexane Retention time (s) Toluene Retention
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be tailored to meet specific synthetic needs. One notable application of IL is the salt ability to act as solvent in many organic reactions is known to accelerate product formation or alter the selectivity of the reaction. For example‚ in the Diels-Alder reaction‚ where higher reaction rate and selectivity are obtained in polar solvents compared to non-polar solvents [17]. However‚ the vast applications of ILs are not without problems‚ one being that yields‚ purity and selectivity can vary according
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(2) [Co(en)2 Cl 2]+ (3) [Co(NH3)3 Cl3] (4) [Co(en) (NH3)2Cl2]+ Ans. (3) 32. Which one of the following molecules is expected to exhibit diamagnetic behaviour ? (2) N2 (1) C2 (3) O2 (4) S2 Ans. (2) 33. A solution of (–) –1–chloro–1–phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5‚ due to the formation of :(1) carbanion (2) Carbene (3) carbocation (4) free radical Ans. (3) 34. Given : 31. E0 Cr 3 / Cr The molarity of a solution obtained by mixing 750 mL of 0
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