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The following reaction occurs at the anode of an electrochemical cell:Zn(s) ? Zn2+ (aq)

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

Solution for problem 87P Chapter 16

Introductory Chemistry | 5th Edition

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

Introductory Chemistry | 5th Edition

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Problem 87P

Problem 87P

The following reaction occurs at the anode of an electrochemical cell:

Zn(s) → Zn2+ (aq) + 2e−

Which cathode reaction would produce a battery with the highest voltage?

(a) Mg2+(aq) + 2e− → Mg(s)

(b) Pb2+ (aq) + 2e− → Pb(s)

(c) Cr3+ (aq) + 3e− → Cr(s)

(a) Cu2+ (aq) + 2e− → Cu(s)

Step-by-Step Solution:
Step 1 of 3

Solution: Here, we are going to identify the cathode reaction producing a battery with the highest voltage with the given anode reaction.

Step1:

Electrochemical cells are the devices which converts chemical energy to electrical energy.

Voltage can be calculated by the following relation:

                                        Ecell = Ecathode – Eanode

Step2:

Greater the value of the standard electrode potential of the cathode, higher will be the voltage. Out of all the reactions given above, Cu2+(aq) + 2e- → Cu(s) has the highest standard electrode potential(0.34 V). Thus, it will produce a battery with the highest voltage.

                                        ------------------------------------

Step 2 of 3

Chapter 16, Problem 87P is Solved
Step 3 of 3

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

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The following reaction occurs at the anode of an electrochemical cell:Zn(s) ? Zn2+ (aq)