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Unformatted text preview: Synthesis of Cobalt Coordination Compounds: [Co(NH 3 ) 5 Cl]Cl 2, [Co(NH 3 ) 5 ONO]Cl 2 , and [Co(NH 3 ) 5 NO 2 ]Cl 2 Consult Chemistry, The Central Science, 9 th edition, Brown, LeMay, Bursten, Chapter 24 for additional information about coordination compounds. Each student will prepare one coordination compound. Safety Precautions: Be especially careful in handling concentrated ammonia, concentrated hydrochloric acid and 30% hydrogen peroxide! I Preparation of [Co(NH 3 ) 5 Cl]Cl 2 In the fume hood, completely dissolve 6 g of NH 4 Cl in ~40 mls of concentrated ammonia in a 400 ml beaker. With continuous stirring, add 12 g of cobalt(II) chloride-hexahydrate in small portions. With continued stirring of the resulting brown slurry, SLOWLY add 10 mls of 30% H 2 O 2 . After the effervescence has stopped, SLOWLY add ~30 mls of concentrated HCl. With continued stirring, heat on a hot plate and maintain 85 o C for 20 minutes. Cool mixture to room temperature in an ice bath and filter (using a Buchner funnel) the crystals of [Co(NH 3 ) 5 Cl]Cl 2 Wash with 5-6, 5 ml portions of ice water (distilled water cooled in ice) and then 5-6, 5 ml portions of cold 6 M HCl. Note the color of your product.Note the color of your product....
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- Spring '10
- Chemistry, NH3, IIB, Characterization of Inorganic Compounds