crystallization technique to purify the solute sulfanilamide using 95% ethanol as the solvent‚ to calculate the amount of sulfanilamide that was recovered‚ and to determine the purity of the final product. Introduction In this experiment‚ recrystallization will be the method used to purify the solute sulfanilamide using ethanol as the solvent. Based on the solubility curve on the solubility versus temperature graph‚ the ideal solvent will allow the solute to be soluble at higher temperatures
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dark brown solution. The crude product has the weight of 6.92g (crude yield 126.6%). After 4 times recrystallization‚ the final product is white with light yellow. The most weight product have melting point with 111.4℃‚ however the M.P. of product after second recrystallization is 93℃ The final product has the weight of 0.35g (yield 6.4%) 4. Discussion (1) Why 4 times of recrystallization is needed The impurity contains acetic anhydride‚ acetic acid‚ Zinc Chloride‚ beta-D- glucopyranose
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The purpose of this experiment is to separate a solution of an acidic and organic compound and purify its respective acidic product through the techniques of an acid base extraction‚ recrystallization‚ and use of Melt Temp (melting point range). The reaction of an unknown acid (3-chlorobenzoic acid) with diethyl and sodium hydroxide was observed‚ and the solution naturally separated into an aqueous and organic solution. The mixture of acid and organic solution was created and then separated through
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Jennie K. Daniels Organic Chemistry 2121 11 February 2014 Synthesis of Aspirin Salicylic acid derivatives‚ or salicin‚ are found in the bark of the willow tree. In the 5th century B.C.‚ Hippocrates ground the bark into a powder‚ and later‚ the Natives Americans chewed on the bark to alleviate fever and pain1. In the 19th century‚ a German chemist by the name of Felix Hoffman wanted to find a medication that would ease
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The early twentieth century led to the discovery of penicillin‚ which revolutionized the use of curative agents to combat many bacterial contagions found around the globe. This was particularly useful in 1943 when the War Production Board outlined a plan to mass-produce a powdered formula of the drug to aid in the WWII American war effort.1 Penicillin’s use on Allied forces in the field reduced the number of amputations and deaths by an estimated 12-15%.2 Despite penicillin’s continued use today
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Samantha Smith Organic Chem 255 Lab M/W 12:30-4:30 Hyejin Cho 12 June 2013 Separation of a Mixture Abstract: In this experiment‚ the three processes of extraction‚ sublimation and recrystallization will be used to separate a mixture of salicylic acid and naphthalene. The first part of extraction will be to separate the salicylic acid from the naphthalene using diethyl ether and aqueous sodium bicarbonate. The naphthalene will reside in the ether and be the top layer‚ while the
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distillation and recrystallization using a suitable solvent determined through a solubility test. The identification method used was through Melting Point Determination. By obtaining data of the melting points of the 2 purified compounds and cross-referencing from a list of possible organic compounds‚ the 2 organic compounds were identified to be Dibenzalacetone (Neutral) and o-Chlorobenzoic acid (Acidic). Results A solubility test was conducted to determine the recrystallization solvent to be used
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stopper White tile Beakers (250 cm3) Dropping pipette Filter funnel Deionised water Phenolphthalein indicator Volumetric flask Melting point experiment apparatus Melting point apparatus Capillaries Thermometer Bunsen burner Recrystallization Filter paper Buchner funnel Conical flask Specular Benzaldehyde + hydrogen peroxide Heat mat Beaker Conical flask
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4 4.3 Melting Point 4 4.4 Appearance 4 5 Discussion 5 6 Conclusion 5 References R1 Synopsis This report is based on preparation and recrystallization of aspirin. The objective of the experiment is to conduct the synthesis of aspirin and reinforce the skills of recrystallization and technique of melting point determination. Both experimental successes and errors were analyzed. The mass of recrystallized aspirin recorded was 0.85g‚ which led to a low percent
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solubility in the early part of the synthesis. Due to this fact‚ any unreacted starting materials would remain soluble throughout the recrystallization process. Additionally‚ the Diels-Alder product is soluble in boiling xylene‚ but insoluble in cool xylene. This makes for an ideal recrystallization solvent. The purified crystals that were collected from the recrystallization were a faint off-white color‚ with a regular‚ shiny plate-like shape. The purity of the crystals was improved as seen in the melting
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