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Page 1 of 6 Experiment #2: “Recrystallization of Impure Benzoic Acid” CHEM2423.P01 – Organic Chemistry I South Texas College Spring 2019 For: Dr. Karlos X. Moreno
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Page 2 of 6 Abstract In this lab a sample of impure benzoic acid will be purified through recrystallization. This lab reinforces the understanding of how recrystallization works and the development of technique with hand on experience. The purity of the final recrystallized sample was compared to previous known infrared (IR) spectroscopy and melting point (mp) for analysis. The purpose of the lab was to understand how impurity affects infrared (IR) spectroscopy and melting point (mp) of a sample. The lab experiment yields 1.461 g of pure benzoic acid after recrystallization, a 71.23% recovery. The melting point range of the purified benzoic acid was 123°C – 124°C, within an acceptable range of 10% of mp of benzoic acid physical constants melting point 122°C. The IR analysis of the purified sample (figure 1.) corresponds to frequencies associated with multiple functional groups including Objectives The purpose of the experiment was to gain practical knowledge on the recrystallization technique to purify a sample of benzoic acid. The final sample was analyzed by verifying the melting point and though an IR spectrum to verify the purity of Benzoic Acid. 1 Introduction Recrystallization is used to purify materials that have impurities. To perform recrystallization, a solid compound is mixed with a hot solvent to form a saturated solution. As the solution cools the solubility of the compound decreases and pure crystals are then formed. The techniques are used by many commercial manufactured when a pure sample is needed. Many of the uses for recrystallization include the purification of both legal and illegal drugs to the purification food products like salt and sugars.
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Page 3 of 6 Materials and Methods The material needed for the experimented included 2 100ml beakers, 2 250ml beakers, 125 mL
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  • Fall '16
  • Dr. Karlos Moreno
  • Infrared Spectroscopy, Infrared, Purified water, Impurity, Recrystallization Lab

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