Lab 4 - Whittling Down the Possibilities Purpose The...

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Whittling Down the Possibilities Purpose The purpose of this lab is to determine the identity of the unknown compounds by measuring their molecular dipole moment, solubility, density, and boiling point and compare these chemical properties with that of the known compounds. Discussion The experiment was divided into four parts in order to test the chemical properties of the unknown: molecular dipole moment, solubility, density, and boiling point. Each group was assigned with a set of four different unknown samples. For part one, the testing for the presence of a molecular dipole moment was performed by using a charged plastic rod. If a stream of the unknown liquid was diverted toward the rod, then the compound had a molecular dipole moment. If not, it was assumed that no or a minimum of molecular dipole moment was present. These observations were due to the fact that the electrostatic charge could attract or repel the dipole charges on the molecule. For part two, the solubility in water was determined by mixing the unknown with distilled water. If no clear separation of the layer was formed, then the unknown was soluble in water. If two distinct layers were observed, then the unknown was said to be insoluble in water. For part three, the density of the unknown relative to water was measured by removing the top layer of the mixture obtained in part two and mix it with sodium chloride. If NaCl dissolved, then the top layer was
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Lab 4 - Whittling Down the Possibilities Purpose The...

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