EXPERIMENT 4: Synthesis of Salicylic Acid from Wintergreen Oil Abstract: The purpose of this experiment is to take methyl salicylate (wintergreen oil) and by heating it under reflux with NaOH as a solvent‚ and then cooling the mixture with H2SO4 as another solvent‚ synthesize salicylic acid. The final step involves purify the product to produce as pure a sample of salicylic acid as possible. This process allowed for the successful production of 1.406g salicylic acid‚ an 82.70% yield. The NMR and
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of a Carboxylic Acid‚ a Phenol‚ and a Neutral Substance (Two-week lab) Reading Assignment 1) Chapter 7 • Introduction: P. 135- first paragraph • Theory and Techniques (p142-145) o Properties of Extraction Solvents o Mixing and Separating the Layers o Drying Agents o Part 1: The Technique of Neutral Liquid/Liquid Extraction The description is for dichloromethane-aqueous solution mixture‚ but you will use the
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esterification and refluxing‚ the acid and alcohol are first warmed and mixed together with the sulphuric acid catalyst then attached it to a reflux condenser for a period of time. Then extraction‚ chloroform was added in to the mixture as organic solvent‚ causing it to form 2 layers. The ester solution layer was then extracted and drying agent was added to remove water. Then the solution undergoes filtration. The last step is the distillation. This step is to distill off impurities by heating the
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Osmosis works with eggs because membranes contain tiny holes that small particles such as water can pass through from high to low concentrations. In this lab‚ the egg is the solute and it is placed in the vinegar which is the solvent. The vinegar is a solution of water (the solvent) and acetic acid (the solute). The water in the vinegar enters the egg through the membrane‚ moving from the higher water concentration in the vinegar to the lower concentration in the egg‚ which causes the egg to increase
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(perhaps you and your neighboring lab group can share and balance each other’s tubes) and do not stop the centrifuge with your fingers! Transfer the extract (liquid) to a clean centrifuge tube. In the original centrifuge tube‚ add a new 4 mL of solvent and repeat the entire extraction procedure. Add the resulting extract to the first extract (in the second centrifuge tube). Now wash (microscale) the combined extracts with saturated NaCl solution (5mL)‚ then with 10% aqueous potassium carbonate
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or property of a certain solute to dissolve in a particular solvent. [1] Miscibility‚ on the other hand‚ is the ability or property of substances to mix in all proportions or thoroughly. This term is usually used in the mixing of liquid substances. [2] In the experiment‚ the students observed the solubility and miscibility of some substances. Table 1 and 2 shows the solubility of salt‚ iodine‚ sugar‚ and naphthalene in different solvents. Table 3 and 4 shows the miscibility of substances to other
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Lab #4 The Synthesis of Organic Polymers CHM2123‚ Section C October 21‚ 2014 Introduction: Organic polymers are macromolecules that are composed of smaller molecules called monomers. There are two main groups of polymers: natural polymers and unnatural (synthetic) polymers. Natural polymers include proteins such as cellulose and starch and are a necessity for our existence. On the other hand‚ synthetic polymers such as the polycarbonate in our lab goggles
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a day. [2] In this lab we will extract and purify caffeine from tea leaves. First water soluble compounds will be extracted from dry tea leaves with boiling water. Then‚ caffeine will be preferentially extracted from the water into organic solvent. The solvent will be removed and the crude material will be purified by sublimation This experiment has the following objectives: (1) to isolate caffeine using multiple extraction‚ (2) to purify caffeine using sublimation‚ (3) to determine the purity
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The Grignard Synthesis of Triphenylmethanol Organic Chemistry Lab II March 19‚ 2012 Abstract The purpose of this experiment was to synthesize the Grignard reagent‚ phenyl magnesium bromide‚ and then use the manufactured Grignard reagent to synthesize the alcohol‚ triphenylmethanol‚ by reacting with benzophenone and protonation by H3O+. The triphenylmethanol was purified by recrystallization. The melting point‚ Infrared Spectroscopy‚ 13C NMR‚ and 1H NMR were used to characterize and confirm
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the greatest amount of each solid was dissolved. Each solution was spotted along a labeled starting line on the silica gel TLC plate. The TLC plate was put into a developing chamber containing 200:1 acetic acid and allowed to developed until the solvent reached almost to the top of the TLC plate‚ which took about 10 minutes. When the TLC plate finished developing‚ I observed the plate under UV light and noticed that the salicylamide was the only spot that fluoresced purple while all the other
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