   # Write balanced equations for the following half-reactions. Specify whether each is an oxidation or reduction. (a) H 2 O 2 (aq) → O 2 (g)⇄(in acid) (b) H 2 C 2 O 4 (aq) → CO 2 (g)⇄(in acid) (c) NO 3 − (aq) → NO(g)⇄(in acid) (d) MnO 4 − (aq) → MnO 2 (s)⇄(in base) ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 19, Problem 2PS
Textbook Problem
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## Write balanced equations for the following half-reactions. Specify whether each is an oxidation or reduction. (a) H2O2(aq) → O2(g)⇄(in acid) (b) H2C2O4(aq) → CO2(g)⇄(in acid) (c) NO3−(aq) → NO(g)⇄(in acid) (d) MnO4−(aq) → MnO2(s)⇄(in base)

(a)

Interpretation Introduction

Interpretation:

The balanced equation for the following half reaction has to be identified and also specify whether the reaction is an oxidation or reduction reaction.

a) H2O2(aq)      O2(g)    (in acid)

Concept introduction:

Steps for balancing half –reactions in ACIDIC solution:

• Balance all atoms except H and O in half reaction.
• Balance O atoms by adding water to the side missing O atoms.
• Balance the H atoms by adding H+to the side missing H atoms.
• Balance the charge by adding electrons to side with more total positive charge.
• Make the number of electrons the same in both half reactions by multiplication, while avoiding fractional number of electrons.

### Explanation of Solution

The given reaction is as follows:

H2O2(aq)  O2(g)

Steps for balancing half –reactions in ACIDIC solution:

1. 1. Balance all atoms except H and O in half reaction.

H2O2(aq)  O2(g)

2. 2. Balance O atoms by adding water to the side missing O atoms.

H2O2(aq)  O2(g)

3. 3. Balance the H atoms by adding H+to the side missing H atoms.

H2O2(aq)   O2(g) + 2H+(aq)

4. 4. Balance the charge by adding electrons to side with more total positive charge

(b)

Interpretation Introduction

Interpretation:

The balanced equation for the following half reaction has to be identified and also specify whether the reaction is an oxidation or reduction reaction.

b) H2C2O4(aq)  CO2(g) (in acid)

Concept Introduction:

Refer to (a)

(c)

Interpretation Introduction

Interpretation:

The balanced equation for the following half reaction has to be identified and also specify whether the reaction is an oxidation or reduction reaction.

c) NO3-(aq)        NO(g)   (in acid)

Concept Introduction:

Refer to (a)

(d)

Interpretation Introduction

Interpretation:

The balanced equation for the following half reaction has to be identified and also specify whether the reaction is an oxidation or reduction reaction.

d) MnO4-(aq)    MnO2(s) (in base)

Concept introduction:

Steps for balancing half –reactions in BASIC solution:

• Balance all atoms except H and O in half reaction.
• Balance O atoms by adding water to the side missing O atoms.
• Balance the H atoms by adding H+to the side missing H atoms.
• Balance the charge by adding electrons to side with more total positive charge.
• Make the number of electrons the same in both half reactions by multiplication, while avoiding fractional number of electrons.
• Add the same numbers of OH- groups as there are H+present to both sides of the equation.

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