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To write:
The complete and balanced
a) (basic solution)
b) (acidic solution)
c)
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Answer to Problem 8.96QA
Solution:
Complete and balanced redox reaction is
a)
b)
c)
Explanation of Solution
1) Concept:
To balance a redox reaction, first we have to assign oxidation numbers to each of the elements in the compound and decide which element is going to be reduced and oxidized. Oxidation is loss of electrons or increase in oxidation number while reduction is gain of electrons or decrease in oxidation number.
2) Given:
i)
ii) (acidic solution)
iii)
3) Calculations:
a)
i) The following preliminary expression relates the known reactant and products:
There are equal number of
ii) We perform an
As
iii) To balance these
iv) The ionic charge on the reactant is
v) Taking an inventory of atoms on both sides of the reaction arrow, we find that the left side has four more
Now the reaction is balanced.
b)
i) The following preliminary expression relates the known reactant and products:
There are equal numbers of on both product and reactant sides, but there are unequal numbers of
ii) We perform an
The
The change in the oxidation number is the same for oxidation and reduction.
iii) The ionic charge on the reactant is
iv) Taking an inventory of atoms on both sides of the reaction arrow, we find that the left side has four more
Now the reaction is balanced
c)
i) The following preliminary expression relates the known reactant and products:
There are unequal numbers of
ii) We perform an
The
The
The change in the oxidation number is the same for oxidation and reduction.
Also there are same number of charges on the reactant and product sides, so the reaction is balanced.
Conclusion:
In a redox reaction, substances either gain electrons or thereby undergo reduction, or they lose electrons and undergo oxidation. The given reaction is redox as the oxidation number of elements in the reactants changes during the reaction.
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Chapter 8 Solutions
Chemistry: An Atoms-Focused Approach (Second Edition)
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