Whittling down the possibilities Lab Report

Whittling down the possibilities Lab Report - Whittling...

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Whittling Down the Possibilities Lab Report Norbert Wang GSI: N. Stephanopoulos Summary of Procedure:  The experiment was divided into four parts that tested four physical  properties of an unknown substance: dipole moment, solubility in water, density vs. water, and  boiling point. From these four measurements it is possible to accuracy identify the unknown  substance. To measure dipole moment a stream of liquid unknown was drained near a statically  charged plastic rod. If the stream of liquid was deflected in any way, a dipole moment can be  assumed for the unknown. This is because static charge can attract and/or repel dipole charges  in a substance. Solubility and density relative to water was easily measured by loading water  and the unknown into a test tube. If a layer was formed the unknown is not soluble and one had  to pipette either the top or bottom layer out and mix it with NaCl. If the NaCl dissolved quickly,  then the layer extracted is water. If not the layer extracted is the unknown. Water is both very  small and very polar so NaCl will be completely dissociated when mixed in. In order for this  method to work, one needs to assume that all the unknowns provided in this lab are not polar  enough to dissolve NaCl totally. From this it is possible to deduce whether the unknown was  less or more dense than water. Finally, the boiling point was measured by measuring the vapor  temperature of the unknown as it boiled. As soon as the temperature remained relatively 
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This lab report was uploaded on 04/05/2008 for the course CHEM 3AL taught by Professor Li during the Spring '08 term at University of California, Berkeley.

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Whittling down the possibilities Lab Report - Whittling...

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