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Unformatted text preview: Uyen Nguyen Chemical Equilibrium: Le Chateliers Principle March 4, 2008 Chem 002, Section 005 Introduction: In this laboratory experiment, students were asked to examine and record the observation of the dissolution of NaCl and the equilibrium between the chloride and aqua complexes of cobalt ion. The purpose of this laboratory activity is to explore the systems in chemical equilibrium and how equilibria can be changed by perturbing the system, either through changing the concentrations of a reactant or product or by changing the temperature. Experimental Procedure: Materials: Distilled water 125 mL Erlenmeyer flask NaCl (table salt) test tubes Parafilm 12 M HCl Gloves Saturated 7.6 M NaNO 3 0.15 M CoCl 2 Dropper Beaker Hot Plate Ice-water bath 95% ethanol Procedures: 1. Add 30mL of distilled water to a 125 mL Erlenmeyer flask. Add NaCl and swirl the solution until all the NaCl dissolves. Continue this until the NaCl just barely fails to dissolve. 2. Divide the solution in three different test tubes. 3. Add a few drops of 12 M HCl to the first test tube and carefully observe whether a precipitate forms or not....
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- Spring '08