Introduction Recrystallization is a method used to purify solid organic compounds. Using the recrystallization technique‚ a solid compound is dissolved in a solvent and the compound slowly crystallizes as the solution cools. Using a filtration technique‚ a pure solid is produced when the molecules of the impure particles in the compound are excluded from the crystal lattice. After obtaining the pure compound‚ a melting point determination procedure can be done using a mel-temp device to correctly
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Introduction: The technique used in this experiment is recrystallization. Recrystallization is an often-used method for purifying solids. Recrystallization works by taking advantage of the different solubility properties of compounds‚ and allows impurities to be removed from crude solids. Performing a recrystallization is usually a straightforward task. First‚ you add a small amount of solvent to the impure compound in a flask‚ and heat the contents until all the material has dissolved. Then‚ you
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Raquel Johnson October 19‚ 2014 Solids: Recrystallization and Melting Points Organic Chemistry 2423 Lab Report: Recrystallization Abstract: The purpose of this lab was to purify an unknown compound by recrystallization. Taking an unknown compound and identifying it by purifying it from its impurities through the use of hot gravity filtration. Then to determine the unknown you were to take the melting point. An unknown compound was recrystallized from hot water to produce 0.99 grams (67% recovery)
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Recrystallization and Melting Point of Benzoic Acid Organic Chemistry 1 10/4/12 Abstract Recrystallization was done to remove impurities from the sample. The percent recovery of benzoic acid during recrystallization is 23.02%. The difference between the pure and impure samples was observed by comparison of melting points. It was found that impure sample had a lower and wider melting point range of 120.1-122.2 (C). The pure sample melting point range was 121.3-122.5 (C). These ranges helped determine
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Title: Recrystallization of Pure Phthalic Acid‚ Naphthalene‚ and Anthracene Introduction Recrystallization is a method used for purifying solid organic compounds. It is the most efficient method to purify and remove impurities from a solid to allow a crystal to grow. The method is when the solute in a hot solvent yields to a solution. Once the solvent cools‚ the solution is saturated with respect to the solute‚ which is when it recrystallizes. A crystal is the end result of the method and it is a
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Chem 21 Fall 2009 Experiment 9 — Recrystallization _____________________________________________________________________________ Pre-lab preparation. (1) Read the supplemental material from Zubrick‚ The Organic Chem Lab Survival Manual. (2) Draw the structure of acetanilide and report relevant physical data. Be sure to cite the source of the data. You should be able to figure out what’s relevant by reading the procedure. (3) Find and report the boiling points of the solvents you will be using
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RECRYSTALLIZATION OF ACETANILIDE ABSTRACT Recrystallization is the primary method for purifying solid organic compounds through the differences in solubility at different temperatures. In this experiment‚ a suitable solvent was first determined. Acetanilide was produced by acetylation of aniline with acetic anhydride. The crude acetanilide was dissolved in a solvent in a heating water bath. The hot solution was filtered and the filtrate‚ cooled slowly in an ice bath as crystals started forming
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I performed a number of steps during this recrystallization lab in order to achieve the desired results‚ which included heating the solvent‚ completing a hot filtration‚ completing a vacuum filtration of a chilled solution‚ as well as drying and calculating the weight and melting point of the final version of the sample. I began the lab with 1.5 grams of the impure acetanilide solute and ended the lab with 0.05 grams of pure acetanilide crystals. The percentage of pure acetanilide I recovered during
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Recrystallization and Melting Point Determination W. H. Bunnelle‚ L. A. Meyer‚ R. E. Glaser (Version 3) Introduction Consider what happens when a solid material is placed in a solvent in which it has a low solubility. Not much! A small fraction of the solid will dissolve‚ but the rest will just sit there. (Actually‚ it doesn’t just ’sit there’ since an equilibrium is in effect‚ with solid molecules going into solution‚ and an equivalent number of dissolved molecules reforming solid‚ but we
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Solids: Recrystallization and Melting Points Reference: Chapter 3. Solids: Recrystallization and Melting Points. Read pages 93-94 and 113-117. Experimental procedure‚ pages 118-119. Parts 1-3. Part 1: Melting points of Urea and Cinnamic Acid. Part 2: Melting point of unknown. Part 3: Melting point of Mixture- Urea and Cinnamic Acid (take melting points of mixtures in 1:4‚ 1:1 and 4:1 ratios). Reactions Main Reaction: Not a chemical reaction but a physical reaction. Urea in solid mixed with
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