Methylene Blue Week 7 CHEM104

Methylene Blue Week 7 CHEM104 - Jake Cummings CHEM 103-031L...

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Jake Cummings April 10, 2014 CHEM 103-031L Group 4A Alexx Good, Breanna Becker Tiantian Yiu Rate Laws with Methylene Blue Introduction: In this experiment, a solution of Potassium Hydroxide, Methylene Blue, and Dextrose were used to determine a rate law to determine how fast the reaction occurs. By shaking the flask containing all of the materials, the solution would turn blue due to the added oxygen. The reaction was then timed to determine how long it took to return to the original colorless solution. This process was tested for excess dextrose, excess methylene blue, and added number of shakes to determine which factor had the most influence on the rate of reaction. The predicted rate law and the reaction being tested are shown below. Results: Throughout the experiment, as different variables were changed, the time for the solution to return to its original colorless self changed. This is due to the changes that
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were made to the solution. The table below illustrates what changes were made, and whether or not they made an impact on the reaction rate. Table 1: Effects of Different Experimental Variables on Time Mass of Dextrose (g) Drops of Methylene Blue Number of Shakes Time of De- coloration #1 (s) Time of De- coloration #2 (s)
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