The Spectrochemical Series Lab Results and Discussion

The Spectrochemical Series Lab Results and Discussion -...

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Results and Discussion An unknown cobalt complex was synthesized and purified. The wavelengths of maximum absorbance in the visible spectrum were measured for five cobalt complexes, including the unknown complex synthesized and purified in this experiment. The visible absorbance measurements were used to identify the five cobalt complexes. Complex B was assigned to be synthesized and purified. 20.0 mL of acetone was measured in a 25.0 mL graduated cylinder and poured into a 100 mL beaker. The acetone appeared as a colorless liquid with low viscosity. The beaker was placed in an ice-water bath to chill, along with a washbottle of distilled water. 4.000 g of ammonium chloride was mixed with 10 mL of distilled water in a 50 mL beaker. The ammonium chloride appeared as fine white crystals. This mixture was gently warmed on a hotplate until the solid ammonium chloride dissolved. The solution was brought to a boil. The mixture appeared as a colorless liquid with low viscosity. 5.000 g of cobalt salt was added to the boiling solution, and the solution was stirred until the solid dissolved. The cobalt salt appeared as red- purple crystals. Mixing the cobalt salt with the solution resulted in a dark blue liquid solution. 0.300 g of activated charcoal was then placed into a 200 mL beaker. The hot solution was added to the beaker and stirred for several minutes. The solution was then cooled in an ice-water bath. The charcoal was a very fine black powder. When the charcoal was mixed with the solution, the solution became dark brown. 15.0 mL of concentrated aqueous ammonia was added to the beaker and was stirred. The solution was then cooled in an ice-water bath until the temperature, observed using a thermometer, reached approximately 10.0°C. The ammonia was a colorless liquid with low viscosity. When it was mixed with the solution, no visible change occurred to the solution. 8.0 mL of 30% hydrogen peroxide was obtained in a dry graduated cylinder and was added to the reaction mixture in small portions with stirring after each addition. The hydrogen peroxide was a colorless liquid with low viscosity. Mixing it with the reaction mixture caused slight fizzing and a sizzling sound for several seconds. A strong odor was produced, and a pink film was seen on the top rim of the mixture. The solution was then heated in a casserole on a steam bath at approximately 60.0°C for 30 minutes. The pink color disappeared. The mixture was allowed to cool to room temperature and then allowed to cool further in
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This note was uploaded on 01/31/2009 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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The Spectrochemical Series Lab Results and Discussion -...

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