Iodine Clock Reaction - Iodine Clock Reaction By Lionel...

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Iodine Clock Reaction By Lionel Sims III Lab Instructor: Anund February 29, 2008
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Results and Discussion: This lab was done with the intention of determining the complete concentration and temperature dependence of the reaction rate for a reaction between peroxydisulfate ion and iodide ion in an aqueous solution. Substances with known concentrations were mixed in a beaker with a magnetic stirrer and had the amount of each chemical and temperature of the mixture changing between each individual trial. The chemicals used were 0.16M KI( aq ), 0.12M (NH 4 ) 2 S 2 O 8 ( aq ), 0.0055M Na 2 S 2 O 3 ( aq ), 0.10 M EDTA( aq ), distilled water, and a solid soluble starch indicator. The starch is an indicator that will turn the mixture a dark blue to make the reaction visually traceable. Two reactions will be taking place in the beaker. The first will produce iodine, and the second involves the reaction of iodine with thiosulfate, which will turn the iodine back into the iodide ion that it came from, allowing the first reaction to happen again. The build up of excess iodine
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This note was uploaded on 04/18/2008 for the course CHEM 342132 taught by Professor Davis during the Spring '08 term at Cornell University (Engineering School).

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Iodine Clock Reaction - Iodine Clock Reaction By Lionel...

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