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Chemistry & Chemical Reactivity

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

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 19.1, Problem 2RC
Textbook Problem
3 views

The balanced half-reaction for NO3 → NO in acid solution is

  1. (a) NO3 → NO + e
  2. (b) 2H+ + e + NO3 → NO + 2H2O
  3. (c) NO3 → NO + O2 + e
  4. (d) 4H+ + 3 e + NO3 → NO + 2H2O

Interpretation Introduction

Interpretation: The balanced half-reaction for NO3  NO in acidic solution is to be determined from the given option.

Concept introduction:

  • The substance that easily be reduced in a reaction is represented as an oxidizing agent. The substance that easily be oxidized in a reaction is represented as an reducing agent.
  • Redox reaction: In a reaction both oxidation and reduction occurs at the same time.

Steps followed to balance a redox (reduction-oxidation) reaction occurs in acidic medium,

  • Redox reacions can be sperated into two half-reactions, such as oxidation reaction and reduction reaction.
  • Balancing of oxygen and hydrogen are carried out by adding water and H+ ions in the half-reactions, and balance the number of elctrons then make the number of electrons in oxidation and reduction reactions equal by multiplying by integers.

Club the both half-reactions

Explanation of Solution

Reason for correct option

The given redox equation is as follows.

NO3  NO

  1. 1. Recognize the reaction as an oxidation and reduction reaction.

    N Reduce their oxidation state from +5to+2 . Therefore, it is a reduction reaction.

  2. 2. The half reaction is.

    NO3  NO

  3. 3.  Balance half reactions by mass.

    Balance all atoms except H and O in half reaction.

    Reduction:     NO3   NO

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

    Reduction:     NO3   NO+2H2O

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

    Reduction:     NO3+4H+   NO+2H2O

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

    Reduction:     NO3+4H+ +3e  NO+2H2O

Therefore,

The balanced half-equation is,

4H+ +

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Chapter 19 Solutions

Chemistry & Chemical Reactivity
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