Chem3AL-Lab3 - Whittling Down the Possibilities Identifying...

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Whittling Down the Possibilities: Identifying an Unknown Using Dipole Moment, Solubility, Density and Boiling Point Data Using three different observations and a measurement (dipole moment, solubility in water, density relative to water and boiling point), I was able to deduce the identities of two unknown liquids. A table of possible unknowns was included in which these four properties were predicted for each unknown before the lab (Table E4.1). As each property was tested, the list of possible unknowns narrowed. After streaming the unknown 1G by a charged rod and observing only slight diversions, I deduced that the unknown did not have a dipole moment, or at least if it did it was a negligible one. This test narrowed the field from sixteen possible unknowns to seven. Mixing the unknown with water actually did not narrow the field down further because each of the seven non-polar unknowns was also immiscible with water, and so was 1G. Testing the densities of the insoluble liquids relative to water, however, did narrow the field down to five. By taking the top layer of the solution and adding it to sodium chloride, the density of the unknown relative to water could be deduced. The top
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This note was uploaded on 02/02/2009 for the course CHEM 3AL taught by Professor Li during the Summer '08 term at Berkeley.

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Chem3AL-Lab3 - Whittling Down the Possibilities Identifying...

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