Experiment_4__Recrystallization_of_Benzoic_Acid_Lab_Report_rduong_duongExperiment4

Experiment_4__Recrystallization_of_Benzoic_Acid_Lab_Report_rduong_duongExperiment4

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EXPERIMENT 4: RECRYSTALLIZATION OF BENZOIC ACID (FORMAL) Introduction: ___11____ / 15 pts Procedure: ____5___ / 7 pts Data and Results (6 points each) : ____19___ / 24 pts Table of Masses from Recrystallization (Part I) containing the initial mass of benzoic acid, the mass of the filter paper, the mass of the filter paper + benzoic acid, and the mass of the recovered benzoic acid. Table of Masses from Acid-Base Extraction (Part II) containing the initial mass of benzoic acid, the mass of the beaker, the mass of the beaker + the mass of benzoic acid, and the mass of recovered benzoic acid. Table of Melting Points - Melting points of crude and purified material along with literature value melting point for benzoic acid. Table of Percent Recovery Data Sample Calculations: ___5____ / 5 pts Percent recovery calculation.
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Discussion ____18___ / 20 pts Compare and contrast the two different purification procedures used in this experiment. Compare the percent recovery of benzoic acid obtained from the two different methods used in this experiment and discuss your findings. Compare the melting point obtained from your recrystallized benzoic acid to the melting point obtained from the impure benzoic acid sample you started with and to the melting point for benzoic acid reported in the literature. Discuss your findings with regards to the goals of this experiment. Observations from the experiment. Did results agree with what would be predicted? Is the discussion section cohesive and well written. 4 Questions: (6 points each) ____23___ / 24 pts Style (organization, neatness, proper formatting etc…) ____4___ / 5 pts Other Deductions (i.e., late lab report, incorrect formatting, etc…) - _______ Score ___85____/ 100 pts
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Experiment 4: The Extraction and Recrystallization of Benzoic Acid Richard Duong September 24, 2009 Christopher Backlund Chem 241L, Section 420, Chapman Hall 125
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The work presented in this report is my own, and the data was obtained by my lab partner and me during the lab period. Introduction The objective of this experiment was to purify an impure compound(acid) using methods of re- crystallization and acid-base (solvent-solvent) extraction. These methods of purifying chemical compounds are solutions for the problem many chemists have when synthesizing compounds- purifying their final product that contain impurities within. These compounds that scientists create can sometimes contain different contaminants from lab errors, impure solutes, etc. Both methods mentioned above are very widespread in today’s chemistry world and can be put to use in just about any laboratory. It is interesting enough to see, if done properly, the amount of pure acid that can be obtained from both an initial known or unknown amount of substance for research purposes. Once a pure substance is obtained, scientists will be able to test for values such as true melting point, vaporization points, freezing points, etc. The first method which will be done in order to purify an acid solution is re-crystallization.
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This document was uploaded on 11/04/2011 for the course CHEM 241 at UNC.

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Experiment_4__Recrystallization_of_Benzoic_Acid_Lab_Report_rduong_duongExperiment4

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