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postlab12 - Laura Lanier Lab L2 Chem 1310 Exp 12 Kinetics...

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Laura Lanier Lab L2 November 30, 2009 Chem 1310 Exp 12. Kinetics Experiment Part A. DATA & RESULTS 1. Data/Results Table Trial [Cyclohexanone ] [I 3 - ] [H + ] Time to Clear (s) Rate (mole/Ls) pH at beginning of reaction pH at end of reaction 1 0.16666667 0.0033333 3 0.3333333 3 217.55 1.5322E-05 1 1 2 0.16666667 0.0033333 3 0.1666666 7 416.24 8.0082E-06 1 1 3 0.08333333 0.0033333 3 0.3333333 3 255.15 1.3064E-05 1 1 4 0.16666667 0.0016666 7 0.3333333 3 93.67 1.7793E-05 1 1 2. Sample Calculations: a. (Trial 1 ) Concentration of I 3 - b. (Trial 1 ) Rate calculation
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3. Calculation to obtain reaction order with respect to to H + 4. Calculation to obtain reaction order with respect to cyclohexanone 5. Calculation to obtain reaction order with respect to triiodide
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6. Calculate k, rate constant, using trial 1. 7. Statement of overall rate law (use numbers just calculated for k,l,m,n: PART B. Arrhenius Plot 1. Data Table Trial T ( o C) t clear (s) Rate (L/mol-s) k (L/mol s) T (K) ln k 1/T (K -1 ) 1 37 74.67 4.46409E-05 0.0001339 310 -8.9182486 0.00322581 2 34 65.36 5.09996E-05 0.000153 307 -8.7850806 0.00325733 3 14 750.63 4.44071E-06 1.332E-05 287 -11.226083 0.00348432 2. Plot ln k vs. 1/T 3. Calculation of Arrhenius Activation Energy Discussion & Topic Questions (30 pts) This experiment focused on trying to identify the rate law for the iodination of cyclohexane, which provides a lot of information about the speed of the reaction and the rate determining steps. The kinetics of the reaction allow chemists to figure out how to
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