   Chapter 18, Problem 15RORR

Chapter
Section
Textbook Problem

# Define oxidation and reduction in terms of both change in oxidation number and electron loss or gain.

(a)

Interpretation Introduction

Interpretation:

The oxidation and reduction reactions should be balanced for the given reactions.

Concept introduction:

Loss of electron is called oxidation process and gain of electron is called reduction process.  In balanced oxidation – reduction reaction, the number of electrons lost is equal to number of electrons gained.

To balance half-reactions in Acidic conditions:

Balance oxidation number with electrons

Balance elements except oxygen andhydrogen.

Balance oxygen withwater.

Balance H with H+ ion.

Balance net charge with electrons

Explanation

Cr(s) ions must loss three electrons and form Cr3+(aq) therefore it get oxidized, and NO3-

(b)

Interpretation Introduction

Interpretation:

The oxidation and reduction reactions should be balanced for the given reactions.

Concept introduction:

Loss of electron is called oxidation process and gain of electron is called reduction process.  In balanced oxidation – reduction reaction, the number of electrons lost is equal to number of electrons gained.

To balance half-reactions in Acidic conditions:

Balance oxidation number with electrons

Balance elements except oxygen andhydrogen.

Balance oxygen withwater.

Balance H with H+ ion.

Balance net charge with electrons

(c)

Interpretation Introduction

Interpretation:

The oxidation and reduction reactions should be balanced for the given reactions.

Concept introduction:

Loss of electron is called oxidation process and gain of electron is called reduction process.  In balanced oxidation – reduction reaction, the number of electrons lost is equal to number of electrons gained.

To balance half-reactions in Acidic conditions:

Balance oxidation number with electrons

Balance elements except oxygen andhydrogen.

Balance oxygen withwater.

Balance H with H+ ion.

Balance net charge with electrons

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