Chemistry 207 (Lab # 1)
Experiment #1: Cooperative Identification of an Organic Solid A.
What needs to be done:
In this lab, one will identify the identity of a colorless organic solid by experimentally finding the physical properties of the solid. Such properties include melting point, mixed melting point, and IR spectrum. With these properties, one will be able to compare their results of the organic solid to see if any other classmates have the same unknown sample. B.
Step one: Obtain a sample of the unknown colorless organic solid. (make sure it is about 1-2mm in amount)/ Obtain materials to grind the solid into fine fragments so that it is able to fit into the capillary tube. Step two: Obtain materials that need to be used to find the melting point of the unknown colorless organic solid (Mel-temp apparatus). Step three: After the solid is completely grinded, pour the fragments into the capillary tube of the Mel-temp apparatus (make sure all of the fragments are at the bottom of the tube). Step four: Turn on the apparatus to adjust the heat setting so that there is a steady heating rate of the solid in order for the melting point not to be passed. (Usually heating rate should be in increments of 1-2 degrees per minute when the solid is near to reach its desired melting point). Step five: When melting point is reached, record the melting point as well as the melting point range. Step six: Compare the melting point of the unknown solid to the melting point of the unknown solids of other students. Step seven: Conduct mixed melting point tests with the mixture of the unknown solid and the unknown solids of students that have similar melting points/ clean up station where the melting point of the unknown itself was conducted. Step eight: Record results
Step nine: Step up for the TLC analysis of the unknown colorless solid/ clean up previous station where mixed melting point was conducted. (note: multiple solvents may have to be used...
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