
(a)
Interpretation:
The given redox reaction is to be balanced using half reaction method.
Concept introduction:
Half reaction method to balance ionic equation in basic solution involve:-
- Assign the oxidation number to each element.
- Check which element is oxidized and which element is reduced. Write
oxidation and reduction half reactions. - Check the change in oxidation number for the elements which are oxidized and reduced.
- Then add enough hydroxyl ions and water molecules to the equation to balance hydrogen atoms on both sides.
- Adjust the coefficients so that number of electrons lost in oxidation is equal to electrons gained in reduction.
- Add the balanced half reactions.

Answer to Problem 69A
Explanation of Solution
The given redox reaction is:
Assigning the oxidation number-
The oxidation numbers of atoms shows that
Change in oxidation number of
Change in oxidation number of
Balancing the atoms and charges:
Now adding both reactions after multiplying oxidation half cell reaction with 4 and reduction half reaction with 3,
(b)
Interpretation:
The given redox reaction is to be balanced using half reaction method.
Concept introduction:
Half reaction method to balance ionic equation in basic solution involve:-
- Assign the oxidation number to each element.
- Check which element is oxidized and which element is reduced. Write oxidation and reduction half reactions.
- Check the change in oxidation number for the elements which are oxidized and reduced.
- Then add enough hydroxyl ions and water molecules to the equation to balance hydrogen atoms on both sides.
- Adjust the coefficients so that number of electrons lost in oxidation is equal to electrons gained in reduction.
- Add the balanced half reactions.

Answer to Problem 69A
Explanation of Solution
The given redox reaction is:
Assigning the oxidation number-
The oxidation numbers of atoms shows that
Change in oxidation number of
Change in oxidation number of
Balancing the atoms and charges:
Now adding both reactions after multiplying oxidation half cell reaction with 3
Chapter 19 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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