Benzoic Acid Lab

Benzoic Acid Lab - Experiment 11 Synthesis of Benzoic Acid...

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Experiment 11 – Synthesis of Benzoic Acid 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 demonstrate how a crude sample of a substance can be synthesized to form a product, which is then purified and analyzed. The report also helps explain how the experiment shows the comparison of purity between two samples after titration. It describes the relationship and characteristics of the two substances before and after recrystalization synthesis, especially comparing the purity of the substance and its melting point. The objective of the experiment was to take a crude sample of a substance, synthesize a product through oxidation, purify this product by recrystallization, and then analyze and compare the purity of the two substances through melting point and acid-base titration. A more pure sample of benzoic acid should form after recrystallization. Through comparison, the two samples of the acid, crude and recrystalized, would show the quality, or purity of both substances. By finding the equivalence point through titration, we can find the purity of a substance. Then, by observing the melting point of the two samples, the purity of each can also be compared. Our goal is to better understand the concept of purity and how it affects each substance. Materials and Methods A 6.305-g sample of potassium permanganate was added to a 500-mL Erlenmeyer flask. Distilled water (45 mL), 1.0 M sodium hydroxide (3.5 mL, 3.5 mmol), 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, a 4 mL 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. 15 milliliters of 2 M sulfuric acid was added to the beaker containing the filtrate.
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Benzoic Acid Lab - Experiment 11 Synthesis of Benzoic Acid...

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