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Unformatted text preview: fly lift the test tube out of the hot water bath and use a white paper background.
8. Repeat the experiment with the next two test tubes for trial #2. Average the results
for each concentration from the two runs and determine the associated errors.
9. Save the test tube containing the 0.05 M reference half-reacted complex (i.e. test tube
#1) for Part II. 70 Part II. Determination of the Activation Energy 1. You have already determined t1/2 for a temperature near 55°C in Part I. However, the
measurement was not held truly constant at 55°C for the entire duration of the
reaction time since the test tube was originally at room temperature and thus required
some time to equilibrate to 55°C in the water bath. For this section, in an effort to get
a more accurate t1/2 determination, you will add solid directly to pre-equilibrated
water in test tubes already at the prescribed water bath temperatures.
2. Prepare six clean test tubes each filled with 3 mL portions of the 0.5 M sulfuric acid
solution you made for Part I...
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- Spring '07