
(a)
Interpretation:
The given
Concept introduction:
Oxidation number method to balance ionic equation involve:-
- Assign the oxidation number to each element.
- Check which element is oxidized and which element is reduced.
- Check the change in oxidation number for the elements which are oxidized and reduced.
- Balance the change in oxidation number by adjusting the coefficients in the equation.

Answer to Problem 81A
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
Thus adjusting the coefficients:
Adjusting the rest atoms:
(b)
Interpretation:
The given redox reaction is to be balanced.
Concept introduction:
Oxidation number method to balance ionic equation in acidic solution involve:-
- Assign the oxidation number to each element.
- Check which element is oxidized and which element is reduced.
- Check the change in oxidation number for the elements which are oxidized and reduced.
- Balance the change in oxidation number by adjusting the coefficients in the equation.
- Then add enough hydrogen ions to balance the charge and water molecules to the equation to balance hydrogen atoms on both sides.

Answer to Problem 81A
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
Thus adjusting the coefficients:
Balancing the atoms:
Now adding hydrogen ions on right side of equation to balance negative charge
Adding water to left side:
Chapter 19 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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