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Solved: Determine whether each reaction is a redox

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 96P Chapter 16

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

4 5 0 294 Reviews
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Problem 96P

Determine whether each reaction is a redox reaction. For those reactions that are redox reactions, identify the substance being oxidized and the substance being reduced.

(a) Pb(NO3)2(aq) + 2 LiCl(aq) → PbCl2(s) + 2 LiNO3(aq)

(b) 2 HBr(aq) + Ca(OH)2(aq) → 2 H2O(l) + CaBr2(aq)

(c) 2 Al(s) + Fe2O3(s) → Al2O3(s) + 2 Fe(l)

(a) Na2O(s) + H2O(l) → 2 NaOH(aq)

Step-by-Step Solution:

Solution 96P :

Step 1:

Here, we have to determine whether each reaction is a redox reaction and identify the substance being oxidized and the substance being reduced for redox reactions :

We identify if the given reaction is redox reaction by looking at its oxidation numbers. If the oxidation numbers of the atoms in the reaction has changed then it’s a redox reaction. If the atom’s oxidation number increases then the atom is oxidized and if the atom’s oxidation number decreases then its reduced.

 

(a) Pb(NO3)2(aq) + 2 LiCl(aq) → PbCl2(s) + 2 LiNO3(aq) :

Let’s assign the oxidation numbers for the atoms here :

        Pb(NO3)2(aq) + 2 LiCl(aq) → PbCl2(s) + 2 LiNO3(aq)

         (+2) (-12)         (+1)( -1)    (+2)(-12)    (+1)( -1)

We know for a neutral atom, the sum of the oxidation numbers should be zero.

Here, in the equation : The oxidation number of NO3 is -1 and since there are 2 atoms of NO3, the oxidation number will be -2 and to counteract that Pb will have the oxidation number of +2. The oxidation number of Cl is -1 and to counteract that Li will have charge of +1. Similarly the oxidation numbers are for PbCl2 and LiNO3. Here, we see there were no change of oxidation numbers of atoms anywhere, Hence this is not a redox reaction.

Step 2:

(b) 2 HBr(aq) + Ca(OH)2(aq) → 2 H2O(l) + CaBr2(aq) :

Let’s assign the oxidation numbers for the atoms here :

        2 HBr(aq)  +  Ca(OH)2(aq)   →      2 H2O(l)   +   CaBr2(aq)

       (+12) (-12)   (+2)( -4+(+2))            (+4)(-4))       (+2)(-12)

We know for a neutral atom, the sum of the oxidation numbers should be zero.

Here, in the equation : The oxidation number of Br is -1 and since there are 2 atoms of Br, the oxidation number will be -2 and the charge of H is +1 and there are 2 atoms of H, so the total charge will be+2. The oxidation number of Ca is -2 and the charge of OH is -1 and there are 2 atoms of OH and their net charge is -2. Similarly the oxidation numbers of H2 in 2H2O is +4 and O is -4. And the oxidation number of Ca in CaBr2 is +2 and Br is -1 . Here, we see that the oxidation number of H is increased from +2 to +4 and oxidation number of O, ca and Br remains

unchanged. Hence this is not a redox reaction.

Step 3 of 4

Chapter 16, Problem 96P is Solved
Step 4 of 4

Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

Since the solution to 96P from 16 chapter was answered, more than 858 students have viewed the full step-by-step answer. The answer to “Determine whether each reaction is a redox reaction. For those reactions that are redox reactions, identify the substance being oxidized and the substance being reduced.(a) Pb(NO3)2(aq) + 2 LiCl(aq) ? PbCl2(s) + 2 LiNO3(aq)(b) 2 HBr(aq) + Ca(OH)2(aq) ? 2 H2O(l) + CaBr2(aq)(c) 2 Al(s) + Fe2O3(s) ? Al2O3(s) + 2 Fe(l)(a) Na2O(s) + H2O(l) ? 2 NaOH(aq)” is broken down into a number of easy to follow steps, and 58 words. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. The full step-by-step solution to problem: 96P from chapter: 16 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. This full solution covers the following key subjects: Being, substance, redox, reactions, reaction. This expansive textbook survival guide covers 19 chapters, and 2045 solutions.

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Solved: Determine whether each reaction is a redox

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