Chemistry for Engineering Students

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



Chemistry for Engineering Students

3rd Edition
Lawrence S. Brown + 1 other
Publisher: Cengage Learning
ISBN: 9781285199023
Chapter 13, Problem 13.51PAE
Textbook Problem

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:


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


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Chapter 13 Solutions

Chemistry for Engineering Students
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Ch. 13 - When you look at several older cars that are...Ch. 13 - What type of corrosion is associated with each of...Ch. 13 - Using the Internet, find three cases where...Ch. 13 - Using the Internet, find three cases where concern...Ch. 13 - For the following oxidationreduction reactions,...Ch. 13 - Explain why a substance that is oxidized is called...Ch. 13 - What is the role of a salt bridge in the...Ch. 13 - Which half-reaction takes place at the anode of an...Ch. 13 - If a salt bridge contains KNO3 as its electrolyte,...Ch. 13 - If a salt bridge contains KNO3 as its electrolyte,...Ch. 13 - The following oxidationreduction reactions are...Ch. 13 - Write a balanced chemical equation for the overall...Ch. 13 - For the reactions in parts (a) and (b) in the...Ch. 13 - Explain why the terms cell potential and...Ch. 13 - How does galvanic corrosion differ from uniform...Ch. 13 - How can each of the following serve as both the...Ch. 13 - A student who has mercury amalgam fillings in some...Ch. 13 - Based on the cell potential measured for the cells...Ch. 13 - If the reaction at a standard hydrogen electrode...Ch. 13 - Four voltaic cells are set up. In each, one...Ch. 13 - If the SHE was assigned a value of 3.00 V rather...Ch. 13 - Explain why a large negative value for the...Ch. 13 - In tables of standard reduction potentials that...Ch. 13 - In the table of standard reduction potentials,...Ch. 13 - Using values from the table of standard reduction...Ch. 13 - Using values from the table of standard reduction...Ch. 13 - One half-cell in a voltaic cell is constructed...Ch. 13 - Four metals, A, B, C, and D, exhibit the following...Ch. 13 - Use the Nernst equation to calculate the cell...Ch. 13 - One half-cell in a voltaic cell is constructed...Ch. 13 - We noted that a tin-plated steel can corrodes more...Ch. 13 - The following half-cells are available: Ag(s);...Ch. 13 - You are a chemical engineer in a firm that...Ch. 13 - Immediately after a person has his or her ears (or...Ch. 13 - In May 2000, a concrete pedestrian walkway...Ch. 13 - A chemical engineering student is studying the...Ch. 13 - How is the relationship between maximum electrical...Ch. 13 - Calculate the standard free energy change for the...Ch. 13 - Calculate the standard free energy change for the...Ch. 13 - Suppose that you cannot find a table of standard...Ch. 13 - Use the potential of the galvanic cell,...Ch. 13 - Which of the following reactions is (are)...Ch. 13 - Consult a table of standard reduction potentials...Ch. 13 - The equilibrium constant for a reaction is 31015...Ch. 13 - Some calculators cannot display results of an...Ch. 13 - Calculate the equilibrium constant for the...Ch. 13 - Use the standard reduction potentials for the...Ch. 13 - Hydrogen peroxide is often stored in the...Ch. 13 - Calculate the equilibrium constant for the redox...Ch. 13 - If a logarithmic scale had not been used for the...Ch. 13 - An engineer is assigned to design an...Ch. 13 - A magnesium bar with a mass of 6.0 kg is attached...Ch. 13 - Would nickel make an acceptable sacrificial anode...Ch. 13 - Zinc is used as a coating for galvanized steel,...Ch. 13 - Sacrificial anodes are sometimes connected to...Ch. 13 - What is the principal difference between a primary...Ch. 13 - Based on the chemistry that takes place, explain...Ch. 13 - If you put a 9-volt battery in a smoke detector in...Ch. 13 - If alkaline batteries were not alkaline but rather...Ch. 13 - What would happen to the voltage of an alkaline...Ch. 13 - Battery manufacturers often assess batteries in...Ch. 13 - Suppose you had a fresh battery and wanted to...Ch. 13 - What product forms from the lead components of a...Ch. 13 - The electrolyte solution in a zinc-air battery...Ch. 13 - You are an electrical engineer investigating...Ch. 13 - Assume the specifications of a Ni-Cd voltaic cell...Ch. 13 - On the Internet, access the website of a major...Ch. 13 - What is the difference between active and passive...Ch. 13 - Why is it easier to force an oxidation—reduction...Ch. 13 - In any electrochemical cell, reduction occurs at...Ch. 13 - When aluminum is refined by electrolysis from its...Ch. 13 - What complication arises in the electrolytic...Ch. 13 - In an electroplating operation, the cell potential...Ch. 13 - When copper wire is placed in a solution of silver...Ch. 13 - In barrel plating, why is the barrel containing...Ch. 13 - When a coating is plated onto a metal, two...Ch. 13 - Use the Internet to find electroplating companies...Ch. 13 - Based on the reaction used for silver plating,...Ch. 13 - If a current of 15 A is run through an...Ch. 13 - Suppose somebody in a laboratory doesn't quite...Ch. 13 - If a barrel plating run uses 200.0 A for exactly 6...Ch. 13 - An electrical engineer is analyzing an...Ch. 13 - In a copper plating experiment in which copper...Ch. 13 - A metallurgist wants to gold-plate a thin sheet...Ch. 13 - Tin-plated steel is used for "tin" cans. Suppose...Ch. 13 - An electrolysis cell for aluminum production...Ch. 13 - If a plating line that deposits nickel (from NiCl2...Ch. 13 - Suppose that a student mistakenly thinks that...Ch. 13 - When a lead storage battery is recharged by a...Ch. 13 - A small part with a surface area of 2.62 cm2 is...Ch. 13 - An engineer is designing a mirror for an optical...Ch. 13 - What two characteristics of lithium-ion batteries...Ch. 13 - Explain why lithium-ion batteries tend to be...Ch. 13 - What characteristic of lithium ions makes it...Ch. 13 - Looking at Figure 13.23, describe how the...Ch. 13 - Use the web to research how Boeing addressed the...Ch. 13 - For a voltage-sensitive application, you are...Ch. 13 - 13.100 For a battery application, you need to get...Ch. 13 - 13.101 An oxidationreduction reaction using Sn(s)...Ch. 13 - 13.102 You are designing a system for a rather...Ch. 13 - 13.103 You need to use a gold-plated connector in...Ch. 13 - 13.104 (a) What happens when a current is passed...Ch. 13 - A current is passed through a solution of...Ch. 13 - 13.106 Hydrazine, N2H4 , has been proposed as the...Ch. 13 - A button case for a small battery must be silver...

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