Lab_4 - Annika Gacnik GSI: Anderson Lo Section 312...

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Annika Gacnik GSI: Anderson Lo Section 312 Experiment 4: Identifying an Unknown Using Dipole Moment, Discussion My lab partner and I began with four unknown liquids, 1E, 2E, 3E, and 4E. We first tested whether the unknowns had dipole moments by charging a plastic rod and releasing a stream of liquid next to it. If the stream curved toward the rod, the molecules were polar and the unknown had a dipole moment. All four of our unknowns curved toward the rod, so we assumed that they lacked dipoles. 1E only curved slightly toward the rod. We then tested the solubility of the unknowns in water and compared them to our predictions for the knowns. If we could not distinguish separate layers of water and unknown in test tube, the unknown was soluble in water. There was no separation between 2E and water, so we could assume that it was a polar, water-soluble compound. If there was separation between the water and unknown layers, the unknown was insoluble. 1E, 3E, and 4E all separated with water, so we assumed that they were polar compounds that were insoluble in water. To narrow the insoluble compounds down further, we tested their density in comparison to water by extracting the top layer of the liquid from the previous
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Lab_4 - Annika Gacnik GSI: Anderson Lo Section 312...

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