(a)
Interpretation:
From the following
Concept Introduction:
Net ionic equation:
Net ionic equation is defined as the specific species that only involves to a particular reaction. This type of equations is generally used in acid-base neutralization reactions and redox reactions.
(a)
Answer to Problem 6K.1E
The Cr is undergoing reduction reaction and their initial and final oxidation number is +6 and +3, respectively. The C is undergoing oxidation reaction and their initial and final oxidation number is
Explanation of Solution
The unbalanced skeletal equation for the reaction is
Reduction reaction:
The oxidation number of
Oxidation number of
Oxidation number of
Therefore, the oxidation number of
Oxidation number of
Oxidation reaction:
The oxidation number of
Oxidation number of
Oxidation number of
Oxidation number of
Therefore, the oxidation number of
Oxidation number of
Oxidation number of
Oxidation number of
Therefore, the oxidation number of
Therefore, the
(b)
Interpretation:
The oxidation half-reaction balanced equation has to be derived.
Concept introduction:
Refer to part (a).
(b)
Answer to Problem 6K.1E
The balanced oxidation half-reaction equation is
Explanation of Solution
Oxidation half-reaction:
The oxidation number of
Balance the
Balance the net charges by adding the electrons.
Here, in left side, the net charge is
Therefore, the balanced oxidation half-reaction is,
(c)
Interpretation:
The reduction half-reaction balanced equation has to be derived.
Concept introduction:
Refer to part (a).
(c)
Answer to Problem 6K.1E
The balanced reduction half-reaction equation is
Explanation of Solution
Reduction half-reaction:
The oxidation number of
Balance the equation except
Balance the
Balance the
Balancing the net charges by adding electrons.
Here, in left side, the net charge is
Therefore, the balanced reduction half-reaction is
(d)
Interpretation:
A balanced redox equation for the combined half reactions has to be derived.
Concept introduction:
Refer to part (a).
(d)
Answer to Problem 6K.1E
A balanced redox equation for the combined half reactions is
Explanation of Solution
Now add the two half reactions together. Match the number of electrons in each side. Because in oxidation half reaction
Add the equation and cancel the common ions and electrons in each side of the arrow.
Divide by 2 each side of the arrow.
Therefore, the balanced net ionic equation the above reaction is,
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Chapter 6 Solutions
Chemical Principles: The Quest for Insight
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