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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 3RC
Textbook Problem
899 views

The balanced half-reaction for Br2 → BrO3 in basic solution is

  1. (a) 3 OH + Br2 → 2BrO3+ H2O + e
  2. (b) 12 OH + Br2 → 2 BrO3 + 6 H2O + 10 e
  3. (c) e + OH + Br2 → 2 BrO3 + H2O
  4. (d) l0e + Br2 + 6H2O → 2BrO3 +6OH

Interpretation Introduction

Interpretation: The balanced half-reaction for Br2 BrO3 in basic 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 basic 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.
  • Add OH ions as equals to H+ ions in both sides, and make it as H2O .
  • Club the both half-reactions.

Explanation of Solution

Reason for correct option

The given reaction is s follows.

12OH +Br22BrO3+6H2O+10e

Steps for balancing half -reactions in basic solution:

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

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

  2. 2. The half-reaction is.

    Br2 BrO3

  3. 3.  Balance half reactions for mass

    Balance all atoms except H and O in half reaction.

    Reduction: Br2 BrO3

    Addition of OH- or OH- and H2O is required for mass balance in both half reactions.

    Reduction: Br2+12OH 2BrO3+6H2O

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

    Reduction: Br2+12OH 2BrO3+6H2O+10e

Therefore,

The balanced half-equation is,

12OH +Br22BrO3+6H2O+10e

Hence the correct option for the balanced half-reaction for Br2 BrO3 in basic solution is option b

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Chapter 19 Solutions

Chemistry & Chemical Reactivity
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