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The Iodide - Persulphate Reaction: Determining the Effect of Concentration on Reaction Rate  

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The Iodide - Persulphate Reaction: Determining the Effect of Concentration on Reaction Rate Name: April Yue Date: February 10, 2004 Student ID: 20131652 Section: 006 T.A. : Mary Diep April Yue (20131652) CHEM 123L Feb. 10, 2004 Experiment 3: The Iodide - Persulphate Reaction: The Effect of Concentration on Reaction Rate Introduction: In this experiment, we utilized the ability for the iodide ion to become oxidized by the persulphate ion. Our general reaction can be described as: (NH4)2S2O8 + 2KI --> I2 + (NH4)2SO4 + K2SO4 (1a) However, we know that in an aqueous solution, all of these compounds except iodine will dissociate into their ionic components. Thus we can rewrite the equation in a more convenient manner: S2O82- + 2I- --> I2 + 2SO42- (1b) It is important however to note that the NH4 and K ions are still in the solution, they are just unreactive. In order to measure the rate of the reaction, the conventional method would be to measure the species...

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