Grime Fighters

Grime Fighters - Bleach: The Grime Fighters I & II...

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Group Participants: Jason Christian , Thomas Cassidy, Brendan Mitchelson, and Samir Kashyap Section Number: 528, Group #8 Meeting Time: 12:30-5:20 February 16 and 23, 2007 TA: Brian Roehm Introduction In an oxidation reduction reaction, the oxidation number of the compounds are changed. Oxidation refers to a compound losing an electron while reduction refers to a compound gaining an electron. Sometimes the compound does not actually lose or gain an electron; however, the oxidation number may change. Oxidation reduction reactions occur when using bleach. The main ingredient in bleach is Cl 2 and NaClO. The bleach works by accepting electrons from compounds. In doing so, the Cl 2 and NaClO reduce the number of electrons on the other compound reducing the compound’s bond length and decreasing the number of bonds. This action reduces the amount of visible light that can be absorded by the bonds. Experiment I Chemical formulas: IO 3 - + 5I - + 6H + 3I 2 + 3H 2 O I 2 + 2S 2 O 3 2I + S 4 O 6 According the to equation, the ratio of S 2 O 3 to I 2 must be a 2:1 ratio. The purpose of this lab was to prove that the stoichiometric coefficients reach equilibrium at the respected ratios, to prepare a standardized solution of a certain molarity and test to see how close was the desired molarity to the standardized solution. Experiment II Chemical formulas: ClO - + 2I - I 2 + Cl - + 2OH I 2 + 2 S 2 O 3 2I - + S 4 O 6 2- According to the equations, the ratio of COl - : S 2 O 3 gives a ratio of 1:2. The purpose of this part of the lab was to find the amount of available chlorine in bleach using the titration of Na 2 S 2 O 3 into NaClO - .
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Experimental Experiment 1 (Part 1) First, 25.0 mL of KIO 3 , 15.0 mL of Na 2 S 2 O 3 , 10.0 mL of H 2 SO 4 , and two grams of KI were obtained. Next, the KIO 3 and the Na 2 S 2 O 3 were added togeterh and swirled in a beaker. Then, the H 2 SO 4 and the KI solution were added together. The observations were reported. Experiment 1 (Part 2) First, 250 mL of a 0.10 M Na 2 S 2 O 3 solution was prepared by adding 6.2045 g of Na 2 S 2 O 3 to 250 mL of water. Then, 100 mL of a 0.01 M KIO 3 solution was prepared by adding 0.214 grams of KIO 3 to 100 mL of water. Next, 50.0 mL of Na 2 S 2 O 3 solution was added to the burette after priming. Then, 25.0 mL of KIO 3 , 2 grams of KI, and about 10.0 mL of 0.5 M H 2 SO 4 were added to a beaker and swirled. The Na 2 S 2 O 3 and KIO 3 solutions were titrated together, using the burette and a stirring rod, until the KIO 3 solution turned clear. Experiment 2 (Part 2)
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Grime Fighters - Bleach: The Grime Fighters I & II...

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