Chomat_Exp11 - Experiment 11 Synthesis of Benzoic Acid Name...

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Experiment 11 – Synthesis of Benzoic Acid Name Michael Chomat Lab Day and Time Monday 1:00 PM TA Na Zhang Section 403 Documentation Lab Manual for Experiment 11 GRADING RUBRIC Possible Points Points Received Introduction 10 Purpose of report Goals of the experiment Materials and Methods 30 Describe procedure in paragraph format following guidelines provided (-2 for each type of mistake) Results and Discussion 40 Inserted titles for tables Inserted graphs into template Inserted captions for each graph Showed complete sample calculations Summarized all data in tables Answered questions completely Error analysis Laboratory Technique 20 TOTAL (100) TA Comments/Suggestions:
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C HEMISTRY 102L R EPORT T EMPLATE EXPT. Synthesis of Benzoic Acid 11 11 Introduction The purpose of this report is to determine the purity of samples of crude and recrystallized benzoic acid using different methods such as titration and melting point range. The objective of the experiment was to create samples of crude and recrystallized benzoic acid and figure out their purity. Materials and Methods A 6.391-g sample of potassium permanganate was added to a 500-mL Erlenmeyer flask. Distilled water (45 mL), 1.0 M sodium hydroxide (3.20 mL, 1.0 mM), and an Aliquat-336 solution (25 mL) were added to the flask, which was gently swirled to mix the reagents and ensure dissolution of the potassium permanganate. Using a graduated cylinder, 4.00 mL of aliquot of benzyl alcohol was added to the reaction mixture. The graduated cylinder was rinsed with 5 mL of water and the rinse water was also added to the flask. The flask was loosely plugged with a rubber stopper and swirled for three minutes. During this time, the mixture warmed considerably as a result of an exothermic reaction. The mixture was swirled occasionally while it cooled to room temperature. The resulting brown solution was filtered with use of a B ü chner funnel and an aspirator. The clear filtrate containing the product of interest was transferred to a 600-mL beaker and the brown manganese (IV) oxide on the filter paper was discarded. Fifteen milliliters of 2 M sulfuric acid was added to the beaker containing the filtrate. While mixing the solution with a stirring rod, additional drops of sulfuric acid were added to the beaker until the solution was approximately pH 2. At this point, white crystals of benzoic acid began to precipitate out of solution. The beaker was cooled in an ice bath until the temperature of the mixture was below 5
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This document was uploaded on 11/04/2011 for the course CHEM 102 at UNC.

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Chomat_Exp11 - Experiment 11 Synthesis of Benzoic Acid Name...

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