Unformatted text preview: General Chemistry laboratory, Chem18 Experiment # 9 Date of Experiment: 11/22/2011 Date of Submission: 11/29/2011 Abstract: This lab was performed in three parts: the first measured the electrical conductivity of 0.05 M solutions of NaCl, CaCl2, AlCl3, HCl, KOH, H 2 C 2 O 4 , K 2 C 2 O 4 , CH3COOH, H2O distilled, H2O tap, and ethanol; the second dealt with the determination of the freezing point of pure tert-butanol, which was the solvent in this experiment; the third dealt with the determination of the molecular weight of the liquid isopropyl alcohol using the freezing point of the liquid in tert-butanol. As conductivity depends on the concentration of ions, ion or proton transport, and type of electrolyte, the conductivity is greatest for strong acids or bases and salts, as acids and bases involve proton transport and salts have a great concentration of ions in solutions of the same molarity. After two trials of measuring freezing points, the average freezing point of 10.00 g pure tert-butanol was 25.1 trials of measuring freezing points, the average freezing point of 10....
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This note was uploaded on 01/23/2012 for the course CHEM 18a taught by Professor Dolnik during the Fall '06 term at Brandeis.
- Fall '06