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postlab12

# 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
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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