Introduction To Chemistry 5th Edition
Introduction To Chemistry 5th Edition
5th Edition
ISBN: 9781260162097
Author: BAUER
Publisher: MCG
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Chapter 14, Problem 58QP

Complete and balance the following oxidation-reduction reactions, assuming they occur in acidic solution.

a  C 2 O 4 2 a q + MnO 4 a q CO 2 g + Mn 2 + a q b  ClO 3 a q + Cl a q Cl 2 a q c  S 2 O 3 2 a q + I 2 a q SO 4 2 a q + I a q

(a)

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

The given redox chemical equation, which takes place in acidic medium, is to be completed and balanced.

Explanation of Solution

The skeleton chemical equation is shown as follows,

MnO4aq+C2O42aqCO2g+Mn2+aq …(1)

The oxidation states are assigned in the above skeleton chemical equation which are shown as follow,

Mn+7O4aq+C+32O42aqC+4O2g+Mn2+aq …(2)

The five electrons are added on the left side of the reduction half-reaction.

Mn+7O4aq+5eMn2+aq …(3)

Two electrons are added on the right side and change the coefficient of carbon dioxide to 2 of the oxidation-half of the given reaction.

C+32O42aq2C+4O2g+2e …(4)

To balance the electrons on both sides of the overall reaction, equation (3) is multiplied with 2 and equation (4) is multiplied with 5 and are added as shown below:

            2Mn+7O4aq+10e2Mn2+aq                       5C+32O42aq10C+4O2g+10e            ¯2Mn+7O4aq+5C+32O42aq2Mn2+aq+10C+4O2g¯   ......5

To balance ionic charge on both of the chemical reactions, 16 hydrogen ions are added on left side of equation (5).

2Mn+7O4aq+5C+32O42aq+16H+2Mn2+aq+10C+4O2g ...(6)

To balance the hydrogen atom 8 of the water molecules are added to the right side of chemical equation (6).

2Mn+7O4aq+5C+32O42aq+16H+2Mn2+aq+10C+4O2g+8H2O …(7)

The chemical equation (7) represents the balanced chemical equation for the given reaction.

(b)

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

The given redox chemical equation, which takes place in acidic medium, is to be completed and balanced.

Explanation of Solution

The skeleton chemical equation is shown as follows,

ClO3aq+ClaqCl2aq ...(8)

The oxidation states are assigned in the above skeleton chemical equation which are shown as follow,

Cl+5O3aq+ClaqCl02aq ...(9)

The 10 electrons are added on the left side and change the coefficient of ClO3 to 2 in the reduction half-reaction.

2Cl+5O3aq+10eCl02aq …(10)

Two electrons are added on right side and change the coefficient of Cl to 2 in the oxidation-half of the given reaction.

2ClaqCl02aq+2e …(11)

To balance the electrons on both sides of the overall reaction, equation (11) is multiplied with 5 .

10Claq5Cl02aq+10e …(12)

Further, equation (10) and equation (12) are added.

2Cl+5O3aq+10Claq6Cl02aq …(13)

To balance ionic charge on both of the chemical reactions, 12 hydrogen ions are added on the left side of equation (13).

2Cl+5O3aq+10Claq+12H+6Cl02aq …(14)

To balance the hydrogen atom 6 of the water molecules are added to the right side of chemical equation (14).

2Cl+5O3aq+10Claq+12H+6Cl02aq+6H2O …(15)

The chemical equation (15) represents the balanced chemical equation for the given reaction.

(c)

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

The given redox chemical equation, takes place in acidic medium, is to be completed and balanced.

Explanation of Solution

The skeleton chemical equation is shown as follows,

S2O32aq+I2aqSO42aq+Iaq …(16)

The oxidation states are assigned in the above skeleton chemical equation which are shown as follow,

S+22O32aq+I02aqS+6O42aq+Iaq …(17)

The two electrons are added on the left side and change the coefficient of I to 2 in the reduction half-reaction.

I02aq+2e2Iaq …(18)

The eight electrons are added on the right side and change the coefficient of SO42 to 2 in the reduction half-reaction.

S+22O32aq2S+6O42aq+8e …(19)

To balance the electrons on both sides of the overall reaction, equation (18) is multiplied with 4 .

4I02aq+8e8Iaq …(20)

Further, equation (19) and equation (20) are added.

S+22O32aq+4I02aq2S+6O42aq+8Iaq …(21)

To balance ionic charge on both sides of the chemical reaction, 10 hydrogen ions are added on the right side of equation (21).

S+22O32aq+4I02aq2S+6O42aq+8Iaq+10H+ …(22)

To balance the hydrogen atom 5 of the water molecules are added to the left side of chemical equation (22).

S+22O32aq+4I02aq+5H2O2S+6O42aq+8Iaq+10H+ …(23)

The chemical equation (23) represents the balanced chemical equation for the given reaction.

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Chapter 14 Solutions

Introduction To Chemistry 5th Edition

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Balancing Redox Reactions in Acidic and Basic Conditions; Author: Professor Dave Explains;https://www.youtube.com/watch?v=N6ivvu6xlog;License: Standard YouTube License, CC-BY