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Cobalt prelab1 - Synthesis and Characterization of...

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Synthesis and Characterization of Cobalt(II) Coordination Compounds Kavya Siripurapu February 15, 2011 CHEM 205 AB3, TA: Chi Ting
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Chemicals used and produced: 30% Hydrogen peroxide Ammonium Fluoride Hydrogen Fluoride Acetone Ethanol 0.1M NaOH 6M, 12M HCl Conc aqueous ammonia Pink crystals of hexaaquacobalt(II) chloride Orange crystals of hexaaminecobalt(II) chloride Cobalt oxide Activated carbon
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Experimental Procedure: SYNTHESIS PROCEDURES: Procedure for Compounds B, E, G 1) Under a hood mix 3g of well-crushed CoCl 2 .6H 2 O with 4g of NH 4 Cl and 10 ml of conc. aqueous ammonia in a 125 ml Erlenmeyer flask. Weigh out the solid reagents on the pan balances in the main lab. Swirl and stir the mixture for a few minutes to convert all or very nearly all of the pink crystals of hexaaquacobalt(II)chloride to orange crystals of hexaaminecobalt(II)chloride. Use a stirring rod to break up the large pink crystals.
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