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Unformatted text preview: increasingly longer amounts of time to complete. At 22 degrees Celsius, the reaction times were 31 seconds for 0.04 M, 46 seconds for 0.03 M, 73 seconds for 0.02 M and 137 seconds for 0.01 M. Our graph revealed that the reaction was first order. We then lowered the temperature of the solutions to 12 degrees Celsius and timed the reaction. For the 0.04 M reaction at the decreased temperature, it took 129 seconds for the reaction to complete, four times slower than run #1. Post Lab Questions (attached) Conclusion In this exercise, we confirmed that the dependence of the overall rate of reaction is first order in iodide ion concentration. We also saw that increasing temperature increases the reaction rate, while decreasing temperature decreases the reaction rate. A graph of 1/t versus [I-] was a straight line, showing the two are proportional....
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This note was uploaded on 08/15/2008 for the course CHM U215 taught by Professor Lui during the Spring '08 term at Northeastern.
- Spring '08