
To assign:
Oxidation numbers to the elements in each compound and

Answer to Problem 8.116QA
Solution:
a) Balanced
Oxidation number of Fe in
Oxidation number of O in
Oxidation number of H in
Oxidation number of O in
Oxidation number of Fe in
Oxidation number of O in
Oxidation number of H in
Oxidation number of O in
Oxidation number of O in
Oxidation number of H in
b) Balanced redox reaction is:
Oxidation number of Fe in
Oxidation number of O in
Oxidation number of H in
Oxidation number of O in
Oxidation number of Fe in
Oxidation number of O in
Oxidation number of O in
Oxidation number of O in
Oxidation number of H in
Explanation of Solution
1) Concept:
For balancing redox reactions, first, the change in oxidation numbers (
2) Given:
The given redox reactions are
These reactions take place in the basic medium.
3) Calculations:
a)
Oxidation number of Fe in
Oxidation number of O in
Oxidation number of H in
Oxidation number of O in
Oxidation number of Fe in
Oxidation number of O in
Oxidation number of H in
Oxidation number of O in
Oxidation number of O in
Oxidation number of H in
Consider the reaction
Let us remove the
The oxidation number of
The oxidation number of
The total oxidation number of O on the left hand side is
The total oxidation number of O on the right hand side is
Hence, we assign a coefficient of 4 to
In order to adjust the ionic charges, we add eight
On taking inventories of O atoms, we see that the equation is unbalanced. In order to balance the number of O atoms, we add six
On taking inventories of atoms on both sides, we see that the redox reaction is now completely balanced.
b)
Oxidation number of Fe in
Oxidation number of O in
Oxidation number of H in
Oxidation number of O in
Oxidation number of Fe in
Oxidation number of O in
Oxidation number of O in
Oxidation number of O in
Oxidation number of H in
Consider the reaction
Let us remove the
We assign a coefficient of 2 to
The oxidation number of
The oxidation number of
The oxidation number of O on the left hand side is
The oxidation number of O on the right hand in
Hence, we need a coefficient of 4 for
In order to adjust the ionic charges, we add eight
On taking inventories of O atoms, we see that the equation is unbalanced. In order to balance the number of O atoms, we add four
On taking inventories of atoms on both sides, we see that the redox reaction is now balanced.
Conclusion:
The redox reactions are balanced using the rules for balancing redox reactions in basic medium.
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Chapter 8 Solutions
Chemistry: An Atoms-Focused Approach (Second Edition)
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