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Chemistry for Engineering Students

3rd Edition
Lawrence S. Brown + 1 other
Publisher: Cengage Learning
ISBN: 9781285199023

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Section
BuyFindarrow_forward

Chemistry for Engineering Students

3rd Edition
Lawrence S. Brown + 1 other
Publisher: Cengage Learning
ISBN: 9781285199023
Chapter 13, Problem 13.51PAE
Textbook Problem
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An engineer is assigned to design an electrochemical cell that will deliver a potential of exactly 1.52 V. Design and sketch a cell to provide this voltage, detailing the solutions, their concentrations, and the electrodes you will need. Write equations for all relevant reactions.

Interpretation Introduction

Interpretation: The chemical reaction in the electro chemical cell should be found providing 1.52V.

Concept introduction:

Electrochemical cells are a device used to generating electrical energy from the chemical reactions. In this electrochemical reaction the electrons shifted one substance to other substance by an oxidation-reduction reaction.

Redox reaction is the shift of electrons from the substance oxidized to one that being reduced.

Explanation of Solution

Consider the cell is constructed by zinc (outer container) act as an anode. The carbon rod is enclosed by the mixture of carbon and manganese (IV) dioxide (MnO2) is act as a cathode. The electrolyte is done by the paste of ammonium chloride (NH4Cl).

The two electrodes are separated by a fibrous fabric.

1-metal cap

II-carbon rod (cathode)

III-zinc case

Iv-manganese (IV) oxide

v- Paste of ammonium chloride

VI- separator between zinc and the electrolyte

Cathode: carbon rod enclosed by mixture of carbon and (MnO2)

Anode: Zinc

Electrolyte: Ammonium chloride

The cathode half- reaction:

2NH4(aq)+2e-2NH3(g)+H2(g)

The manganese (IV) oxide in the cell removes the hydrogen generated by the ammonium chloride, based on the following reaction:

2MnO2(s)+H2

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Chapter 13 Solutions

Chemistry for Engineering Students
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