cobalt - Chris Stanton Chemistry 216 May 3, 2007 The Cobalt...

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Chris Stanton May 3, 2007 Chemistry 216 The Cobalt Complex Project I. Introduction During this lab, a transition metal complex is first created, purified, and then tested to observe the color of the complex, which is expressed quantitatively in the visible absorption spectrum by using spectral analysis. The complex I created specifically was Complex A, which consisted of Co w (NH 3 ) x Cl y . The purification and eventual spectral analysis allows for the wavelength of the color absorbed to be determined. This will then allows for the determination of which metal ion or ligand distribution is present in my complex. After all of this has been determined, the actual empirical formula of the cobalt complex can be calculated. II. Experimental Procedure A. Preparation of Complex A 1. Wash a 5 – dram vial and place it in a beaker and into a dry oven at about 110 °C for an hour. Remove the cap of the vial before placing into the oven. After an hour, allow the vial to cool, place the cap on, and weigh it. 2. Obtain about 20 mL of acetone in a small beaker and place it in an ice bath. Also place your wash bottle of distilled water in the ice bath. These must remain cold for the duration of the experiment. 3. Dissolve about 5 grams of cobalt chloride hexahydrate (CoCl 2 ∙6H 2 O) in about 7 mL of water in a 50 mL beaker. 4. Add this solution to a large casserole that contains a well-stirred mixture of 16 grams of ammonium chloride in 16 mL of concentrated aqueous ammonia. Do this in the HOOD because the concentrated ammonia is very volatile. 5.
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This note was uploaded on 11/05/2009 for the course CHEM 2160 taught by Professor Lee, s during the Spring '08 term at Cornell University (Engineering School).

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cobalt - Chris Stanton Chemistry 216 May 3, 2007 The Cobalt...

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