Experiment 2- Melting Point Identification.docx

Experiment 2- Melting Point Identification.docx - CHEM...

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CHEM 223302 Expt.2 Pre-lab I. Part 1 (Melting Points and the Identification of an Unknown) 1. Weigh 0.5g of each pure compounds (benzoic acid, succinimide, trans -stilbene) in a clean vial or test tube. Using a metal spatula, grind up the pure compounds into fine powder on a clean, hard surface. Take the open end of the capillary tube and press it into the powder to add the material. Then, turn the capillary tube over and tap it to try to push the powder down and pack the tube. To be more efficient, drop the tube through the long glass tube several times vertically, placing flat end down. The height of the powder in the tube should be 2-3mm and packed tightly. Mark the tube in this way: benzoic acid with 1 dot succinimide with 2 dots trans -stilbene with 3 dots 2. Using the DigiMelt Set the Start Temp to 105 , the Stop Temp to 135 and the Ramp Rate to 2 /min. When you first see the signs of melting in the compound, record the temp down.
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