CHEM 132L Lecture Notes - Lecture 4: Rate Equation, Reaction Rate, Activation Energy

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Post Lab Assignment Kinetics of Thiosulfate and Hydrogen Ions
Name: Isbah Afzal
Lab Partner(s): Alexis Romas
Lab Section Number: 123L-005
Due Date: 10/20/2017
Data and Calculations Part A
Table 1. Changing concentrations vs rate.
Run
Vol.
(mL)
S2O32-
Vol
(mL)
H2O
Vol
(mL)HCl
Time
(s)
Temp.
(oC)
Log
[S2O32-]
Log
[H+]
Log
1/t
1
50
0
5
47
-
-1.11
-0.84
-1.67
2
40
10
5
52
-
-1.21
-0.84
-1.72
3
30
20
5
1:23
(83)
-
-1.33
-0.84
-1.92
4
20
30
5
2:17
(137)
22
-1.51
-0.84
-2.14
5
20
25
10
1:55
(115)
-
-1.51
-0.54
-2.06
6
20
20
15
1:46
(106)
-
-1.51
-0.36
-2.02
7
20
15
20
1:40
(100)
-
-1.51
-0.24
-2
Raw Slope (m) = 0.7946
Rounded to the nearest whole number = 1.0
y = 0.7946x + 0.19
R² = 0.979
-1.6
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
-2.5 -2 -1.5 -1 -0.5 0
Log [S2O32-]
Log 1/t
Log 1/t vs Log [S2O32-]
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Document Summary

Post lab assignment kinetics of thiosulfate and hydrogen ions. Rounded to the nearest whole number = 1. 0. 0. 9: write the experimentally determined rate equation. State the order of the reaction with respect to each reactant and the overall reaction order. Log rate = log (1. 38066x10-23 j/k) + 1log [0. 0850] +4log[1. 60] Part b: create a typed table that concisely presents the data collected for part b, including the calculated average temperature (average of initial and final temperature of the solution). Remember to clearly label the table with a title and headers for all data columns/ rows. Show the calculation for the determination of the activation energy and report this value (including units! Questions: in parts a and b of this experiment, the total volume of the reaction mixture was kept constant by the addition of water if necessary. Keeping the volume constant not only makes the calculations easier but it also gives accurate results.