Analysis The crude product (aspirin) was purified in the last lab‚ using recrystallization‚ in which we dissolved the crude product with hot ethanol. We then added 25 mL of water until the product reformed (the solution became cloudy white) and redissolved the solid with hot ethanol. The solution was allowed to cool for a week‚ and crystals of purified solid were formed. In order to analyze this purified product‚ we determined the melting point by placing a small sample of the aspirin in a
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the impurities should be insoluble in the solvent. 2.> How were soluble impurities removed from the derivative? [ANS] By soaking the impure derivative in 1 cm3 of methanol and resume suction. Repeat this for about 2 times. 3.> In the recrystallization procedure‚ why were the crystals dissolved in only the minimum amount of
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is the purpose of determining the melting point in this lab? 5. Why is this method not used for finding the melting points of inorganic ionic compounds? Recrystallization Questions 1. What is the purpose of recrystallization? It is the primary method of purifying crude solid compounds. 2. What is the recrystallization method based on? It is a process based on the differences in solubilities of solids in a given solvent system. 3. How can you increase the solubility of
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LIDE Learning Center‚ Inc. 6539 Isabel‚ Leyte Synthesis of Aspirin An Investigatory Project Presented to: Edmundo A. Quiñones Chemistry Teacher In Partial Fulfillment of the Requirements In Science and Technology III (Chemistry) Presented by: Kenneth Ivan P. Durano Cyrill Val G. Lozano March 6‚ 2010 APPROVAL SHEET This investigatory project entitled “The Synthesis of Aspirin” requirement for Science and Technology III (Chemistry) has
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Synthesis of Acetanilide By: Rick Whitely April 9‚ 2013 Organic Chemistry Lab 1; Professor J. Hutchison Recrystallization is a common method of purifying organic substances through the differences in solubility at different temperature. In this experiment‚ acetanilide was produced by acetylation of aniline with acetic anhydride. The crude acetanilide was dissolved in a solvent in a heated water bath. The solution was cooled slowly in an ice bath as crystals form out. As the compound crystallizes
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DETERMINATION OF THE HEAT OF SOLUTION BY THE VANT HOFF ISOCHORE METHOD Jan Vincent Arafiles‚ Merry Joy Arzaga‚ Anne Louise Ayson‚ Lovely Jenny Buenaflor Group 2 3A-Biochemistry chem401 laboratory ABSTRACT Thermodynamic values can be determined using the Vant Hoff isochore method. This method entails the use of equilibrium systems to determine the change in enthalpy of the solution‚ which can b related to the change in internal energy of the solution. The van ’t Hoff isochore relates
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surface. Vacuum filtration was used isolate the solid from the liquid-solid mixture after the sulphuric acid is qqadded and that the precipitation has occurred and that the pH is down to 2. Recrystallization was then used to purify the salicylic acid formed earlier. Boiling water was used to perform the recrystallization. Melting point helped to characterize organic compound and to assure its purity. Physical Properties Name Molar Weight Melting Point Boiling Point Density Methyl salicylate 152.1 g/mol
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Introduction: Recrystallization is used for the purification of solid compounds. The recrystallization process relies on the fact that majority of compounds are more soluble in hot solvent than in cold. The hot saturated solution containing the compound will have unwanted impurities and will be filtered out and cooled to produce the pure crystal constituents of the compound. Thin layer chromatography can be used as a physical method to segregate compounds from natural sources. E.g. Spinach
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experiment was to make sure that the compound that was formed in the first half of the experiment was actually alum. Some of the experimental techniques that were used in this experiment was filtration using the Büchner funnel vacuum filtration‚ recrystallization using an ice bath‚ melting point using the Mel-temp equipment and water of hydration using heat to dehydrate the compound. For the experiment‚ the theoretical yield appeared to be 18.90g of alum and the actual yield was 12.198g of alum‚ which
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Synthesis of Aspirin Learning Goals 1. To synthesize aspirin from salicylic acid and acetic anhydride. 2. To purify the crude product by Recrystallization. Introduction Most drugs are chemical compounds which are described as "organic compounds" because they are comprised primarily of the elements carbon‚ hydrogen and oxygen. The present experiment will be the synthesis of a familiar organic compound called aspirin. The common chemical name is acetylsalicylic acid. Aspirin‚ the
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