One published value for Keq for FeSCN2+ formation is approximately 113 at 20oC. Based on this value, does equilibrium favor the formation of FeSCN2+, or does it favor the reverse reaction? Briefly justify your answer.
One published value for Keq for FeSCN2+ formation is approximately 113 at 20oC. Based on this value, does equilibrium favor the formation of FeSCN2+, or does it favor the reverse reaction? Briefly justify your answer.
Chapter11: Dynamic Electrochemistry
Section: Chapter Questions
Problem 3P
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Question
One published value for Keq for FeSCN2+ formation is approximately 113 at 20oC. Based on this value, does equilibrium favor the formation of FeSCN2+, or does it favor the reverse reaction? Briefly justify your answer.
![Determination of the Equilibrium
Constant (Keg) for FeSCN2+
Fe*(aq) + SCN'(aq)
FESCN2+
[FESCN2]
Ke=
[ Fe**][SCN]
Procedure
1.
Obtain three small beakers and number them 1-3.
2.
Using burets, dispense into each test the following quantities of solutions.
Beaker
0.002M Fe³
3+
0.002 M SCN-
0.5M HNO3
1
5.0 mL
0.5 mL
4.5 mL
2
5.0 mL
2.0 mL
3.0 mL
3
5.0 mL
4.0 mL
1.0 mL
3.
With occasional mixing, let the beakers sit for 10 min.
4.
Measure the absorbance of each solution at 447nm.
5.
Using the provided calibration curve, determine the concentration of FeSCN²+ in
each of the three beakers.
6.
Based upon the equilibrium concentration of FeSCN²*, determine the equilibrium
constant (Keg) for each solution.
7.
Determine the average equilibrium constant for this reaction.
Data
Beaker
Absorbance
1
2
3](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1f6a3af1-7d9c-414f-b6ff-93014fc5701c%2Ff86b404e-5eac-4ad9-9617-86088c889f31%2Fr7o1i99_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Determination of the Equilibrium
Constant (Keg) for FeSCN2+
Fe*(aq) + SCN'(aq)
FESCN2+
[FESCN2]
Ke=
[ Fe**][SCN]
Procedure
1.
Obtain three small beakers and number them 1-3.
2.
Using burets, dispense into each test the following quantities of solutions.
Beaker
0.002M Fe³
3+
0.002 M SCN-
0.5M HNO3
1
5.0 mL
0.5 mL
4.5 mL
2
5.0 mL
2.0 mL
3.0 mL
3
5.0 mL
4.0 mL
1.0 mL
3.
With occasional mixing, let the beakers sit for 10 min.
4.
Measure the absorbance of each solution at 447nm.
5.
Using the provided calibration curve, determine the concentration of FeSCN²+ in
each of the three beakers.
6.
Based upon the equilibrium concentration of FeSCN²*, determine the equilibrium
constant (Keg) for each solution.
7.
Determine the average equilibrium constant for this reaction.
Data
Beaker
Absorbance
1
2
3
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