PROBLEM 1 A sample of primary standard grade K:Cr:O7 (M.M. = 294.20) weighing 0.2153 g is dissolved, the solution acidified and excess Kl added. The liberated I2 requires 44.86 mL of the NazS:Oa for titration. 1A. Complete the reduction half reaction for Cr2O72-/Cr* (3 pts) Cr2072 (aq). +. H*(aq). +. Cr**(aq). +. H20 1B. Complete the oxidation half reaction for 1M2 (3 pts) (aq). 12(aq). +. .e 1C. What is the stoichiometric mole ratio of the net redox reaction for the reaction between K2Cr207 and 12? (2 pts) mole K2Cr207 =, mole l2
PROBLEM 1 A sample of primary standard grade K:Cr:O7 (M.M. = 294.20) weighing 0.2153 g is dissolved, the solution acidified and excess Kl added. The liberated I2 requires 44.86 mL of the NazS:Oa for titration. 1A. Complete the reduction half reaction for Cr2O72-/Cr* (3 pts) Cr2072 (aq). +. H*(aq). +. Cr**(aq). +. H20 1B. Complete the oxidation half reaction for 1M2 (3 pts) (aq). 12(aq). +. .e 1C. What is the stoichiometric mole ratio of the net redox reaction for the reaction between K2Cr207 and 12? (2 pts) mole K2Cr207 =, mole l2
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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Please answer the following sample exercises
![Show the complete solution (include all units of measurement and the required conversion factors) to each of the
following problems. Enclose the final numerical answer (round-off the final answer to the correct number of significant
figures) in a box.
PROBLEM 1 A sample of primary standard grade K:Cr:O7 (M.M. = 294.20) weighing 0.2153 g is dissolved, the solution
acidified and excess Kl added. The liberated lz requires 44.86 mL of the Na:S:O3 for titration.
1A. Complete the reduction half reaction for Cr2072/Cr+ (3 pts)
Cr2072 (aq). +.
H*(aq). +.
Cr**(aq). +.
H20
1B. Complete the oxidation half reaction for 1M2 (3 pts)
(aq).
2(aq). +.
e
1C. What is the stoichiometric mole ratio of the net redox reaction for the reaction between K2Cr207
and l2? (2 pts)
mole K2Cr207 =.
mole l2
2A. Complete the reduction half reaction for I2/t (2 pts)
12(aq). +.
(aq)
e
2B. Complete the oxidation half reaction for S2032/ S.Og? (2 pts)
S20 (aq).
S40,2-
20. What is the stoichiometric mole ratio of the net redox reaction for the reaction between l2 and
NazS203? (2 pts)
mole l2 =.
mole NazS203](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F060c24a1-948a-4f31-979d-b298852e58d6%2F529fbb0d-5300-40a1-82f0-3e23398d7c66%2Fm4omz6b_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Show the complete solution (include all units of measurement and the required conversion factors) to each of the
following problems. Enclose the final numerical answer (round-off the final answer to the correct number of significant
figures) in a box.
PROBLEM 1 A sample of primary standard grade K:Cr:O7 (M.M. = 294.20) weighing 0.2153 g is dissolved, the solution
acidified and excess Kl added. The liberated lz requires 44.86 mL of the Na:S:O3 for titration.
1A. Complete the reduction half reaction for Cr2072/Cr+ (3 pts)
Cr2072 (aq). +.
H*(aq). +.
Cr**(aq). +.
H20
1B. Complete the oxidation half reaction for 1M2 (3 pts)
(aq).
2(aq). +.
e
1C. What is the stoichiometric mole ratio of the net redox reaction for the reaction between K2Cr207
and l2? (2 pts)
mole K2Cr207 =.
mole l2
2A. Complete the reduction half reaction for I2/t (2 pts)
12(aq). +.
(aq)
e
2B. Complete the oxidation half reaction for S2032/ S.Og? (2 pts)
S20 (aq).
S40,2-
20. What is the stoichiometric mole ratio of the net redox reaction for the reaction between l2 and
NazS203? (2 pts)
mole l2 =.
mole NazS203
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