Experiment #12 Study of the Kinetics of a Reaction

Experiment #12 Study of the Kinetics of a Reaction - 5...

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Experiment 12 Study of the Kinetics of a Reaction Mass/drop 0.02 g Volume/drop 0.02 ml Part I : Determination of the Rate Law and the Rate Constant (k) Volume/drop 0.000019 liters Drops of each reactant used Exper. KI HCl Starch Total [Stock] 0.01 0.1 2% 0 0.04 Drops 1 2 4 2 1 1 2 12 2 4 2 2 1 1 2 12 3 6 0 2 1 1 2 12 4 2 2 2 1 1 4 12 5 2 0 2 1 1 6 12 6 2 2 4 1 1 2 12 7 2 0 6 1 1 2 12 8 3 1 3 1 1 3 12 Time(s) Temp Rate Initial Conc Exper. Trial 1 Trial 2 Trial 3 Trial 4 Average (M/s) 1 173 173 22.1 8.03E-08 0.00167 0.00667 0.01667 2 84 84 22.1 1.65E-07 0.00333 0.00667 0.01667 3 56 56 22.1 2.48E-07 0.00500 0.00667 0.01667 4 88 88 22.1 1.58E-07 0.00167 0.01333 0.01667 5 61 61 22.1 2.28E-07 0.00167 0.02000 0.01667 6 42 42 22.1 3.31E-07 0.00167 0.00667 0.03333 7 18 18 22.1 7.72E-07 0.00167 0.00667 0.05000 8 32 32 22.1 4.34E-07 0.00250 0.01000 0.02500 H 2 0 Na 2 S 2 O 3 KBrO 3 o C [I - ] [BrO3 - ] [H + ]
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Isolated Comparing Change Change Order of Reactant Exp Conc Rate Reactant 1 and 2 2 2.06 1.04 1 and 4 2 1.97 0.98 1 and 7 3 9.61 2.06 Corrrect rate law: Calculated rate constant (k) Exper. Therefore: 1 26.01 Rate = 26.33 2 26.79 3 26.79 Experiment No. 8 - Test of rate constant (k) 4 25.57 Observed Rate 4.34E-07 M/s
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Unformatted text preview: 5 24.59 Calculated Rate 4.11E-07 M/s 6 26.79 Percent Error 5.50 % 7 27.78 Avg k 26.33 Part II : Determination of the Activation Energy Temp Average Rate of Rate Measured Temp Rx Time Reaction Constant, k ln k 4 data sets are minimum (K) (1/T) (s) (M/s) 3.5 276.5 3.62E-03 90 1.54E-07 50.00 3.91 11.1 284.1 3.52E-03 168 8.27E-08 26.79 3.29 22.1 295.1 3.39E-03 75 1.85E-07 60.00 4.09 30.5 303.5 3.29E-03 46 3.02E-07 97.83 4.58 38.1 311.1 3.21E-03 46 3.02E-07 97.83 4.58 I-BrO 3-H + Rate = k[I-] 1 [BrO 3 ] 1 [H + ] 2 k (M-3 s-1 ) [I-] 1 [BrO 3 ] 1 [H + ] 2 ( o C) (M-3 s-1 ) 2.51 kJ/mol E a 3.10E-03 3.20E-03 3.30E-03 3.40E-03 3.50E-03 3.60E-03 3.70E-03 3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.60 4.80 f(x) = -2607.75x + 12.98 R = 0.62 ln k versus 1/Temp 1/Temp ln k...
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Experiment #12 Study of the Kinetics of a Reaction - 5...

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