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Unformatted text preview: cted reference test tube referred to in Step 9 of Part I to determine the t1/2 at that
temperature. Time how long it takes mixture to reach the desired "gray" color.
5. Each pair of students should exchange data so that both of you have t1/2 at five
temperatures. For t1/2 at 80°C use the average value of data you and your partner
Clean-up: The cobalt solutions in the test tubes must be discarded in the waste
container labeled cobalt complex solution waste found in the fumehood. Any solid
green cobalt complex will be collected in the container labeled Cobalt complex solid
waste. 71 Part I.
Question B: From your measured half-lives, you should be able to state the dependence
of the half-life on the concentration of trans-[Co(en)2Cl2]+.
Question C: Determine the order of your reaction and discuss any potential sources of
error. Part II
Question D: For each of the five temperatures, calculate the rate constant and then plot
ln k as a function of 1/T. What is the energy of activation for the reaction?
Question E: What is the value of the rate constant at 25° C?
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07