Lab Report - Tim Squire Dr Kennedy Chem 1212k Lab Report...

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Tim Squire Dr. Kennedy Chem 1212k 5/6/2009 Lab Report There are many ways that colors can be derived from the natural world. Metals can react in interesting ways to produce shades that a chemist is looking for. Cobalt is one element that can react to form interesting colors, including ‘Cobalt Blue’. The purpose of the 1212K laboratory was to perform a series of chemical analyses on a particular compound, in order to compute the quantity of elements and compounds in the sample. This compound had a unique color to it. The overall experiment consisted of various procedures that allowed analysis of particular compounds. First, synthesis of the cobalt-ammonia-halide compound was necessary to produce the compound to be tested on. The synthesis conducted was synthesis #1, which meant that the compound would consist of a Cl - ion. Next, analysis was done on the unknown to determine the percent halide, or Cl - ion, in the compound. After standardizing the hydrochloric acid solution, the compound was analyzed for the percent ammonia. Next, a sodium thiosulfate solution was standardized and used to determine the percent Co in the compound. Synthesis procedure #1 was followed to produce a cobalt-amine-chloride product. Data for this experiment is listed in figure 1-1. 12 grams of cobalt(II) chloride hexahydrate (CoCl 2 +6 H 2 O) was added to 8 grams of ammonium chloride (NH 4 Cl). The ammonium solution was boiling in order to lower the activation energy necessary for the two compounds to react. In addition, the ammonium was necessary to produce the final product. Charcoal and aqueous ammonia was also added in to the mixture. Charcoal is added because of it’s capability to absorb materials so well, and ammonia to react with the cobalt for the desired product. Activated charcoal absorbs impurities in the solution, in addition to everything else, and thus can be used later in the experiment. Peroxide is Page 1 of 6
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Tim Squire Dr. Kennedy Chem 1212k 5/6/2009 then added in order to create a ‘redox’ reaction, where the peroxide becomes water and the Cobalt(II) will become Cobalt (III). The oxygen in the peroxide gains an electron for
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This note was uploaded on 04/28/2008 for the course CHEM 1202 taught by Professor Kennedy during the Fall '07 term at Georgia State.

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Lab Report - Tim Squire Dr Kennedy Chem 1212k Lab Report...

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