Reference no: EM131517876
Reaction Order and Rate Laws
Lab Report Assistant
This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment's questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students' writing of lab reports by providing this information in an editable file which can be sent to an instructor.
Exercise 1: Determining the Rate Laws of the Reaction between HCl and Na2S2O3
Data Table 1. Varying Concentrations of 1.0 M HCl.
|
|
Concentrations
|
|
|
|
# of drops
|
# of drops
|
# of drops
|
Stock Solution
|
Stock Solution
|
Reaction (after mixing in well)
|
Reaction (after mixing in well)
|
Reaction Time
(seconds)
|
Reaction
Rate
(sec-1)
|
|
Well #
|
HCl
|
H2O
|
Na2S2O3
|
HCl
|
Na2S2O3
|
HCl
|
Na2S2O3
|
Trial 1
|
Trial 2
|
Average
|
|
|
C1, D1
|
12
|
0
|
8
|
1M
|
0.3M
|
.6
|
.12
|
30.76
|
32.90
|
31.83
|
.0314
|
|
C2, D2
|
6
|
6
|
8
|
1M
|
0.3M
|
.3
|
.12
|
35.10
|
38.11
|
36.61
|
.0273
|
|
C3, D3
|
4
|
8
|
8
|
1M
|
0.3M
|
.2
|
.12
|
46.23
|
47.79
|
47.01
|
.0213
|
Data Table 2. Varying Concentrations of 0.3 M Na2S2O3.
|
|
Concentrations
|
|
|
|
# of drops
|
# of drops
|
# of drops
|
Stock Solution
|
Stock Solution
|
Reaction (after mixing in well)
|
Reaction (after mixing in well)
|
Reaction Time
(seconds)
|
Reaction
Rate
(sec-1)
|
|
Well #
|
HCl
|
H2O
|
Na2S2O3
|
HCl
|
Na2S2O3
|
HCl
|
Na2S2O3
|
Trial 1
|
Trial 2
|
Average
|
|
|
C4, D4
|
8
|
0
|
12
|
1M
|
0.3M
|
.4
|
.18
|
22.47
|
22.02
|
22.45
|
.0449
|
|
C5, D5
|
8
|
6
|
6
|
1M
|
0.3M
|
.4
|
.09
|
49.44
|
50.76
|
50.1
|
.02
|
|
C6, D6
|
8
|
8
|
4
|
1M
|
0.3M
|
.4
|
.06
|
107.2
|
105.59
|
105.395
|
.0095
|
Questions
A. Determine the Reaction Order for HCl.
B. Determine the Reaction Order for Na2S2O3.
C. Write the rate law for the reaction between HCl and Na2S2O3.
D. Using the following rate law, and the experimental values given, calculate k:
RATE = k[F2][ClO2]
|
Experiment
|
[F2] (M)
|
[ClO2] (M)
|
Initial rate (M/s)
|
|
1
|
0.5
|
0.5
|
0.300 M/s
|
|
2
|
0.8
|
0.8
|
0.768 M/s
|
|
3
|
0.5
|
0.8
|
0.480 M/s
|
E. Describe sources of error in this experiment?