
Concept explainers
Balance the following redox equations by the half-reaction method.
(a) H2O2 + Fe2+ → Fe3+ + H2O (in acidic solution)
(b) Cu + HNO3 → Cu2+ + NO + H2O (in acidic solution)
(c) CN− + MnO4− → CNO− + MnO2 (in basic solution)
(d) Br2 → BrO3− + Br− (in basic solution)
(e) S2O32− + I2 →I− + S4O62− (in acidic solution)
(a)

Interpretation: The given redox equation should be balanced by using half-reaction.
Concept Introduction:
Redox equation: balancing redox equation in basic solution is identified to that of acidic solution except for the last few steps as shown below
To balance the equation, use the following steps:
Firstly, divide the equation into two halves an oxidation half-reaction and reduction half reaction by grouping appropriate species.
Lastly Balance the oxygen atom using water molecule.
Answer to Problem 18.1QP
Explanation of Solution
Draw the balanced half –reaction and type of charge.
Balancing redox equation
Balancing each half reaction and type of atoms and charges.
(b)

Interpretation: The given redox equation should be balanced by using half-reaction.
Concept Introduction:
Redox equation: balancing redox equation in basic solution is identified to that of acidic solution except for the last few steps as shown below
To balance the equation, use the following steps:
Firstly, divide the equation into two halves an oxidation half-reaction and reduction half reaction by grouping appropriate species.
Lastly Balance the oxygen atom using water molecule.
Answer to Problem 18.1QP
Explanation of Solution
Draw the balanced half –reaction and type of charge.
Balancing redox equation
Balancing each half reaction and type of atoms and charges
(c)

Interpretation: The given redox equation should be balanced by using half-reaction.
Concept Introduction:
Redox equation: balancing redox equation in basic solution is identified to that of acidic solution except for the last few steps as shown below
To balance the equation, use the following steps:
Firstly, divide the equation into two halves an oxidation half-reaction and reduction half reaction by grouping appropriate species.
Lastly Balance the oxygen atom using water molecule.
Answer to Problem 18.1QP
Explanation of Solution
Draw the balanced half –reaction and type of charge.
Balancing redox equation
Balancing each half reaction and type of atoms and charges
(d)

Interpretation: The given redox equation should be balanced by using half-reaction.
Concept Introduction:
Redox equation: balancing redox equation in basic solution is identified to that of acidic solution except for the last few steps as shown below
To balance the equation, use the following steps:
Firstly, divide the equation into two halves an oxidation half-reaction and reduction half reaction by grouping appropriate species.
Lastly Balance the oxygen atom using water molecule.
Answer to Problem 18.1QP
Explanation of Solution
Draw the balanced half –reaction and type of charge.
Balancing redox equation
Balancing each half reaction and type of atoms and charges
(e)

Interpretation: The given redox equation should be balanced by using half-reaction.
Concept Introduction:
Redox equation: balancing redox equation in basic solution is identified to that of acidic solution except for the last few steps as shown below
To balance the equation, use the following steps:
Firstly, divide the equation into two halves an oxidation half-reaction and reduction half reaction by grouping appropriate species.
Lastly Balance the oxygen atom using water molecule.
Answer to Problem 18.1QP
Explanation of Solution
Draw the balanced half –reaction and type of charge.
Balancing redox equation
Balancing each half reaction and type of atoms and charges
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Chapter 18 Solutions
Chemistry: Atoms First
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