In Questions 1 through 6, you will be calculating the initial concentrations of Fe³+ ([Fe³+]o) and SCN ([SCN]o) for each of the reactions you will perform. You should transfer the answers to these questions to the appropriate ICE table(s) on the "Data and Calculations" sheet. In all five reactions, you will be using 5.0 mL of 0.0020 M Fe(NO3)3. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [Fe³+] in all five of the reactions you will study? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. If you want to enter your answers scientific notation, use the format that Blackboard recognizes: 1.5 x 10-3 would be entered as 1.5E-3 (no spaces). QUESTION 2 In Test Tube 1, you will be using 1.0 mL of 0.0020 KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN ] in Test Tube 1? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. QUESTION 3 In Test Tube 2, you will be using 2.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN ] in Test Tube 2? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. QUESTION 4 In Test Tube 3, you will be using 3.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN ] in Test Tube 3? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. QUESTION 5 In Test Tube 4, you will be using 4.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN ] in Test Tube 4? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. QUESTION 6 In Test Tube 5, you will be using 5.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN ] in Test Tube 5? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. 0.0010 QUESTION 7 What is the correct expression for Ke for the reaction you will be studying in this experiment. Assume that all concentrations are measured at equilibrium. The chemical equation for this reaction is: Fe 3+ (aq) + SCN "(aq) Kc = ([Fe³+][SCN]) / [FeSCN²+] • Kc = [FeSCN²+] / [[Fe³+][SCN]) Ke=[SCN]/([Fe³+][FeSCN²+1) FeSCN 2+ (aq)

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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QUESTION 8
Why will you be measuring the absorbance of each of your reaction mixtures after they have reached equilibrium?
The measured value of the absorbance is identical to the equilibrium concentration of FeSCN2+, [FeSCN²* Jeq
The measured value of the absorbance is directly proportional to the equilibrium concentration of Fe³+, [Fe³+Jeq
• The measured value of the absorbance is directly proportional to the equilibrium concentration of FeSCN²+, [FeSCN²+ Jeq
The measured value of the absorbance is inversely proportional to the equilibrium concentration of FeSCN²+, [FeSCN²+Jeg
None of the above
QUESTION 9
True or false?
The initial concentration of FeSCN 2+ in each reaction will be the same as the initial concentration of Fe 3+.
True
O False
QUESTION 10
You may find it helpful to refer to the ICE table below as you answer Questions 10 through 12.
Consider data for Test Tube 3, which consists of 5.0 mL of 0.0020 M Fe(NO 3) 3 + 3.0 mL of 0.0020 M KSCN + 2.0 mL of H 20
to give a total volume of 10.0 mL.
Initial
Change
Equilibrium
[Fe³+]
Q1 answer
-X
Q11 answer
[SCN]
Q4 answer
-X
Q12 answer
[FeSCN²+]
+x
x = Q10 answer
Suppose the measured absorbance of this Test Tube 3 reaction mixture, after it is thoroughly stirred, is 0.368. Use Equation
(3) in the "Background and Procedure" handout to calculate [FeSCN 2+] eq
Enter your numerical answer, WITHOUT UNITS, in the box below. Include 3 significant figures.
QUESTION 11
Use your answers for Questions 1 and 10 to calculate [Fe 3+] eq, the equilbrium concentration of Fe 3+, for the Test Tube 3
reaction mixture described in Question 10.
Enter your numerical answer, WITHOUT UNITS, in the box provided. Include 2 significant figures.
QUESTION 12
Use your answers for Questions 4 and 10 to calculate [SCNeq, the equilbrium concentration of SCN, for the Test Tube 3
reaction mixture described in Question 10.
Enter your numerical answer, WITHOUT UNITS, in the box provided. Include 2 significant figures.
QUESTION 13
What is the calculated value of Kc for the Test Tube 3 reaction mixture described in Question 10? To answer this Question,
you will need to plug your answers for Questions 10, 11, and 12 into the expression for Kc, which you identified if you
correctly answered Question 7.
Transcribed Image Text:QUESTION 8 Why will you be measuring the absorbance of each of your reaction mixtures after they have reached equilibrium? The measured value of the absorbance is identical to the equilibrium concentration of FeSCN2+, [FeSCN²* Jeq The measured value of the absorbance is directly proportional to the equilibrium concentration of Fe³+, [Fe³+Jeq • The measured value of the absorbance is directly proportional to the equilibrium concentration of FeSCN²+, [FeSCN²+ Jeq The measured value of the absorbance is inversely proportional to the equilibrium concentration of FeSCN²+, [FeSCN²+Jeg None of the above QUESTION 9 True or false? The initial concentration of FeSCN 2+ in each reaction will be the same as the initial concentration of Fe 3+. True O False QUESTION 10 You may find it helpful to refer to the ICE table below as you answer Questions 10 through 12. Consider data for Test Tube 3, which consists of 5.0 mL of 0.0020 M Fe(NO 3) 3 + 3.0 mL of 0.0020 M KSCN + 2.0 mL of H 20 to give a total volume of 10.0 mL. Initial Change Equilibrium [Fe³+] Q1 answer -X Q11 answer [SCN] Q4 answer -X Q12 answer [FeSCN²+] +x x = Q10 answer Suppose the measured absorbance of this Test Tube 3 reaction mixture, after it is thoroughly stirred, is 0.368. Use Equation (3) in the "Background and Procedure" handout to calculate [FeSCN 2+] eq Enter your numerical answer, WITHOUT UNITS, in the box below. Include 3 significant figures. QUESTION 11 Use your answers for Questions 1 and 10 to calculate [Fe 3+] eq, the equilbrium concentration of Fe 3+, for the Test Tube 3 reaction mixture described in Question 10. Enter your numerical answer, WITHOUT UNITS, in the box provided. Include 2 significant figures. QUESTION 12 Use your answers for Questions 4 and 10 to calculate [SCNeq, the equilbrium concentration of SCN, for the Test Tube 3 reaction mixture described in Question 10. Enter your numerical answer, WITHOUT UNITS, in the box provided. Include 2 significant figures. QUESTION 13 What is the calculated value of Kc for the Test Tube 3 reaction mixture described in Question 10? To answer this Question, you will need to plug your answers for Questions 10, 11, and 12 into the expression for Kc, which you identified if you correctly answered Question 7.
In Questions 1 through 6, you will be calculating the initial concentrations of Fe³+ ([Fe³+10) and SCN ([SCN]o) for each
of the reactions you will perform. You should transfer the answers to these questions to the appropriate ICE table(s) on
the "Data and Calculations" sheet.
In all five reactions, you will be using 5.0 mL of 0.0020 M Fe(NO3)3. Each reaction mixture will be diluted to a final volume of 10.0
mL. What is [Fe³+]o in all five of the reactions you will study? Type your answer, WITHOUT UNITS, in the box below. Include 2
significant figures.
If you want to enter your answers in scientific notation, use the format that Blackboard recognizes: 1.5 x 10-3 would be entered as
1.5E-3 (no spaces).
QUESTION 2
In Test Tube 1, you will be using 1.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL.
What is [SCN ] in Test Tube 1? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures.
QUESTION 3
In Test Tube 2, you will be using 2.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL.
What is [SCN ] in Test Tube 2? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures.
QUESTION 4
In Test Tube 3, you will be using 3.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL.
What is [SCN ] in Test Tube 3? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures.
QUESTION 5
In Test Tube 4, you will be using 4.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL.
What is [SCN ] in Test Tube 4? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures.
QUESTION 6
In Test Tube 5, you will be using 5.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL.
What is [SCN] in Test Tube Type your answer, WITHOU UNITS, in box below. Include 2 significant figures
0.0010
QUESTION 7
What is the correct expression for Kc for the reaction you will be studying in this experiment. Assume that all concentrations
are measured at equilibrium. The chemical equation for this reaction is:
Fe 3+ (aq) + SCN (aq)
FeSCN 2+ (aq)
Kc = ([Fe³+][SCN]) / [FeSCN²+]
• Kc = [FeSCN²+] / [[Fe³+][SCN)
Kc = [SCN]/([Fe³+][FeSCN²+1)
2+
2+
Transcribed Image Text:In Questions 1 through 6, you will be calculating the initial concentrations of Fe³+ ([Fe³+10) and SCN ([SCN]o) for each of the reactions you will perform. You should transfer the answers to these questions to the appropriate ICE table(s) on the "Data and Calculations" sheet. In all five reactions, you will be using 5.0 mL of 0.0020 M Fe(NO3)3. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [Fe³+]o in all five of the reactions you will study? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. If you want to enter your answers in scientific notation, use the format that Blackboard recognizes: 1.5 x 10-3 would be entered as 1.5E-3 (no spaces). QUESTION 2 In Test Tube 1, you will be using 1.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN ] in Test Tube 1? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. QUESTION 3 In Test Tube 2, you will be using 2.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN ] in Test Tube 2? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. QUESTION 4 In Test Tube 3, you will be using 3.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN ] in Test Tube 3? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. QUESTION 5 In Test Tube 4, you will be using 4.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN ] in Test Tube 4? Type your answer, WITHOUT UNITS, in the box below. Include 2 significant figures. QUESTION 6 In Test Tube 5, you will be using 5.0 mL of 0.0020 M KSCN. Each reaction mixture will be diluted to a final volume of 10.0 mL. What is [SCN] in Test Tube Type your answer, WITHOU UNITS, in box below. Include 2 significant figures 0.0010 QUESTION 7 What is the correct expression for Kc for the reaction you will be studying in this experiment. Assume that all concentrations are measured at equilibrium. The chemical equation for this reaction is: Fe 3+ (aq) + SCN (aq) FeSCN 2+ (aq) Kc = ([Fe³+][SCN]) / [FeSCN²+] • Kc = [FeSCN²+] / [[Fe³+][SCN) Kc = [SCN]/([Fe³+][FeSCN²+1) 2+ 2+
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