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3AL Lab 4 - Stephen Wilson(SID 18974524 GSI Timothy Fei...

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Stephen Wilson (SID: 18974524) GSI: Timothy Fei Experiment #4 March 17 th , 2008 Chem 3AL Section 111 Whittling Down The Possibilities Purpose: The purpose of this lab was to utilize different methods to pinpoint the identity of an unknown solution by matching the results to pre-collected information. Methods: Each group was given a set of four unknown vials to find four properties of each; dipole moment, solubility in water, density relative to water, and boiling point. We first tested to see if the unknown solution had a dipole moment by squirting it next to an electrostatically charged plastic rod, if the liquid curved toward the rod, then it had a dipole moment. The next test was to find if it was soluble in water, to do this we put equal amounts of both liquid and water in a test tube, then pulled it all into a Pasteur pipette and squirted it back into the test tube violently. We repeated this three times then recorded whether or not it was two layers or not, with two layers meaning it was not soluble.
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