51LA Exp1 F10 - EXPERIMENT#1 Identification of a White Solid Tuesday September 28 Monday October 4 Technique Melting Point Category Identification

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51LA 1 Rev 9/24/10 EXPERIMENT #1 Identification of a White Solid Tuesday, September 28 – Monday, October 4 Technique: Melting Point Category: Identification The melting point of a compound is useful in establishing its identity and is a criterion of its purity. By finishing Experiment #1, we will master the melting point determination technique to identify a given unknown solid compound. Reading Assignment for Exp #1: Read Technique 14: Melting Points and Melting Ranges and Technique 5.4: Measuring Temperature in Techniques in Organic Chemistry 3 rd Ed. pgs 174-183 and pgs 47-49. (Technique 10 in 2 nd Ed. pgs 116-126) Pre-Lab Questions: 1. A student in 51LA conducts a melting point experiment with an unknown compound and observes a melting range of 120–126 C. Is this a typical range for a melting point? If not, what range would be typical? 2. The student’s TA thinks that the height of the sample in the capillary tube might account for the student’s results. What height of sample SHOULD the student have in the capillary tube and why? 3. The student decides to test his technique by conducting a known melting point determination. When the temperature in the Mel-Temp reaches within 15–20 C of the melting point temperature of the compound, how fast should the student allow the temperature to rise?
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This note was uploaded on 11/23/2010 for the course CHEMISTRY Chem 51 LA taught by Professor Dr.reneelink during the Spring '10 term at UC Irvine.

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51LA Exp1 F10 - EXPERIMENT#1 Identification of a White Solid Tuesday September 28 Monday October 4 Technique Melting Point Category Identification

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