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Lab 11 InLab - Chemical Kinetics (In-Lab)
Current Score : Due : Thursday, June 20 2013 01:00 PM EDT
The due date for this assignment is past. Your work can be viewed below, but no changes can be made.
Important! Before you view the answer key, decide whether or not you plan to request an extension. Your Instructor may
not grant you an extension if you have viewed the answer key. Automatic extensions are not granted if you have viewed the
answer key.
Request Extension
1. 1/1 points | Previous Answers NCSUGenChem202LabV1 11.IL.01.
Since this is the last lab and the TAs will be busy studying for their own exams, your lab grades will be
submitted soon after the last assignment is due. The target grade submission date for this lab is 1 week
after all work has been turned in. Please make sure that you discuss any grade concerns with your TA
before you leave the lab.
(a) I understand that lab grades will be submitted very soon after the last assignment is due.
(b) I will discuss any grade concerns with my TA before I depart from the last lab.
Yes
No
Additional Materials
Chemical Kinetics
Lab Safety and Practices
2. 34/34 points | Previous Answers NCSUGenChem202LabV1 11.IL.02.
Complete the following table.
Data Table A: Determination of Rate Law: 2 I ! + S2O82- → I2 + 2 SO42-
run mL of mL of 0.100 mL of mL of 0.2 mL of elapsed time
# 0.200 M M 0.0050 M M 0.100 M (sec)
KI (NH4)2S2O8 Na2S2O3 KCl (NH4)2SO4
24.3
1 20.0 20.0 10.0 0.0 0.0
24.3
51.8
2 10.0 20.0 10.0 10.0 0.0
51.8
3 5.00 20.0 10.0 15.0 0.0 82.4
, 82.4
60.1
4 20.0 10.0 10.0 0.0 10.0
60.1
97.8
5 20.0 5.00 10.0 0.0 15.0
97.8
In-Lab Question 1. What are the initial concentrations of iodide, persulfate, and thiosulfate in the first
run? Account for dilution and show your work on the worksheet. Enter your calculation in Data Table B.
In-Lab Question 2-3. What is the rate of the reaction in the first run? Show your work on the
worksheet. Enter your calculation in Data Table B.
Complete the following table.
Data Table B: Calculations for Determination of Rate Law
run initial [I !] initial [S O 2-] initial [S O 2-] Rate k
2 8 2 3
#
2.1e-5 0.0066
0.0800 0.0400 0.0010
1 2.1e-05
0.0800 M 0.0400 M 0.0010 M
M/s 0.0064
9.7e-6 0.0061
0.0400 0.0400 0.0010
2 9.7e-06
0.0400 M 0.0400 M 0.0010 M
M/s 0.0061
6.1e-6 0.0076
0.0200 0.0400 0.0010
3 6.1e-06
0.0200 M 0.0400 M 0.0010 M
M/s 0.0076
8.3e-6 0.0052
0.0800 0.0200 0.0010
4 8.3e-06
0.0800 M 0.0200 M 0.0010 M
M/s 0.0052
5.1e-6 0.0064
0.0800 0.0100 0.0010
5 5.1e-06
0.0800 M 0.0100 M 0.0010 M
M/s 0.0064
In-Lab Question 4a. Select all of the following that are true about the rate of the reaction and [I !]
based on your data from Data Table B. (Select all that apply.)
Lab 11 InLab - Chemical Kinetics (In-Lab)
Current Score : Due : Thursday, June 20 2013 01:00 PM EDT
The due date for this assignment is past. Your work can be viewed below, but no changes can be made.
Important! Before you view the answer key, decide whether or not you plan to request an extension. Your Instructor may
not grant you an extension if you have viewed the answer key. Automatic extensions are not granted if you have viewed the
answer key.
Request Extension
1. 1/1 points | Previous Answers NCSUGenChem202LabV1 11.IL.01.
Since this is the last lab and the TAs will be busy studying for their own exams, your lab grades will be
submitted soon after the last assignment is due. The target grade submission date for this lab is 1 week
after all work has been turned in. Please make sure that you discuss any grade concerns with your TA
before you leave the lab.
(a) I understand that lab grades will be submitted very soon after the last assignment is due.
(b) I will discuss any grade concerns with my TA before I depart from the last lab.
Yes
No
Additional Materials
Chemical Kinetics
Lab Safety and Practices
2. 34/34 points | Previous Answers NCSUGenChem202LabV1 11.IL.02.
Complete the following table.
Data Table A: Determination of Rate Law: 2 I ! + S2O82- → I2 + 2 SO42-
run mL of mL of 0.100 mL of mL of 0.2 mL of elapsed time
# 0.200 M M 0.0050 M M 0.100 M (sec)
KI (NH4)2S2O8 Na2S2O3 KCl (NH4)2SO4
24.3
1 20.0 20.0 10.0 0.0 0.0
24.3
51.8
2 10.0 20.0 10.0 10.0 0.0
51.8
3 5.00 20.0 10.0 15.0 0.0 82.4
, 82.4
60.1
4 20.0 10.0 10.0 0.0 10.0
60.1
97.8
5 20.0 5.00 10.0 0.0 15.0
97.8
In-Lab Question 1. What are the initial concentrations of iodide, persulfate, and thiosulfate in the first
run? Account for dilution and show your work on the worksheet. Enter your calculation in Data Table B.
In-Lab Question 2-3. What is the rate of the reaction in the first run? Show your work on the
worksheet. Enter your calculation in Data Table B.
Complete the following table.
Data Table B: Calculations for Determination of Rate Law
run initial [I !] initial [S O 2-] initial [S O 2-] Rate k
2 8 2 3
#
2.1e-5 0.0066
0.0800 0.0400 0.0010
1 2.1e-05
0.0800 M 0.0400 M 0.0010 M
M/s 0.0064
9.7e-6 0.0061
0.0400 0.0400 0.0010
2 9.7e-06
0.0400 M 0.0400 M 0.0010 M
M/s 0.0061
6.1e-6 0.0076
0.0200 0.0400 0.0010
3 6.1e-06
0.0200 M 0.0400 M 0.0010 M
M/s 0.0076
8.3e-6 0.0052
0.0800 0.0200 0.0010
4 8.3e-06
0.0800 M 0.0200 M 0.0010 M
M/s 0.0052
5.1e-6 0.0064
0.0800 0.0100 0.0010
5 5.1e-06
0.0800 M 0.0100 M 0.0010 M
M/s 0.0064
In-Lab Question 4a. Select all of the following that are true about the rate of the reaction and [I !]
based on your data from Data Table B. (Select all that apply.)
