Orgo Lab 1 - Andrew Klingsporn Organic Chemistry Lab 1-701...

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Andrew Klingsporn Organic Chemistry Lab 1-701 Measuring the Melting Points of Compounds and Mixtures Purpose The purpose of this experiment is to measure the melting points of pure benzoic acid and pure mandelic acid; and determine the eutectic composition and eutectic temperature of these acid mixtures. The other purpose of this experiment is to identify an unknown compound using mixture melting points. Procedure Experiment 1: Place 2-3 mg of finely powdered benzoic acid on a clean dry watch glass. Put the benzoic acid into a capillary tube until there is approximately 1mm of powder at the base. Place the capillary tube in a heating device and raise the temperature by 10 degrees per minute until it reaches 110 degrees. Slow the rate of heating to two degrees per minute until the acid melts completely. Record the data. Repeat the same procedure for the mandelic acid and the four benzoic/mandelic acid mixtures. Experiment 2: Obtain 10 mg of an unknown substance and record its identification number. Place approximately one mm of the unknown in a capillary tube and place in a heating device and obtain an orientation melting point. Use the chart in the book to determine the substances whose melting points fall in the same vicinity of the unknown’s. Then mix equal amounts of the unknown with the acid that was in that range. Place the two acid mixtures with one sample of pure unknown in capillary tubes. Heat the three capillary tubes to
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Orgo Lab 1 - Andrew Klingsporn Organic Chemistry Lab 1-701...

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