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Four voltaic cells are set up. In each, one half-cell contains a standard hydrogen electrode. The second half-cell is one of the following: (i) Cr 3+ (aq, 1.0 M)|Cr(s) (ii) Fe a+ (aq, 1.0M)|Fe(s) (iii) Cu 2+ (aq, 1.0M)|Cu(s) (iv) Mg 2+ (aq, 1.0M)|Mg(s) (a) In which of the voltaic cells does the hydrogen electrode serve as the cathode? (b) Which voltaic cell produces the highest potential? Which produces the lowest potential?

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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 19, Problem 61GQ
Textbook Problem
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Four voltaic cells are set up. In each, one half-cell contains a standard hydrogen electrode. The second half-cell is one of the following:

  1. (i) Cr3+(aq, 1.0 M)|Cr(s)
  2. (ii) Fea+(aq, 1.0M)|Fe(s)
  3. (iii) Cu2+(aq, 1.0M)|Cu(s)
  4. (iv) Mg2+(aq, 1.0M)|Mg(s)
  5. (a) In which of the voltaic cells does the hydrogen electrode serve as the cathode?
  6. (b) Which voltaic cell produces the highest potential? Which produces the lowest potential?

(a)

Interpretation Introduction

Interpretation:

The voltaic cell in which the hydrogen electrode serves as the cathode has to be identified.

Concept introduction:

Voltaic cell or Galvanic cell:

The device to produce electricity by using chemical reactions. In these divces are redox chemical reactions are occured.

A voltaic cell converts chemical energy into electrical energy.

It consists of two half cells. Each half cell consists of a metal and a solution of a salt of metal. Two half cells are connected by salt bridge.

The chemical reaction in the half cell is an oxidation reduction (redox)reactions.

For example:

Cell diagram of voltaic or galvanic cell is as follows.

                 Salt bridge                        Cu(s)|Cu2+(aq)  ||  Ag+(aq)|Ag(s)____________     ___________                                       Half cell             Half cell

Explanation of Solution

The cathodic site of reaction is reduction half reaction.

The reduction reaction is as follows.

2H+(aq) +2e- H2(g)

Therefore, the following voltaic cell does the hydrogen electrode serve as the cathode.

  Cr3+(aq, 1

(b)

Interpretation Introduction

Interpretation:

The voltaic cell which produces the highest potential and the lowest potential has to be identified.

Concept introduction:

Voltaic cell or Galvanic cell:

The device to produce electricity by using chemical reactions. In these divces are redox chemical reactions are occured.

A voltaic cell converts chemical energy into electrical energy.

It consists of two half cells. Each half cell consists of a metal and a solution of a salt of metal. Two half cells are connected by salt bridge.

The chemical reaction in the half cell is an oxidation reduction (redox)reactions.

For example:

Cell diagram of voltaic or galvanic cell is as follows.

                 Salt bridge                        Cu(s)|Cu2+(aq)  ||  Ag+(aq)|Ag(s)____________     ___________                                       Half cell             Half cell

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Chapter 19 Solutions

Chemistry & Chemical Reactivity
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Ch. 19.3 - Which of the following statements is correct for...Ch. 19.3 - 2. You can determine if an automobile lead-based...Ch. 19.4 - (a) Rank the following metals in their ability to...Ch. 19.4 - The net reaction that occurs in a voltaic cell is...Ch. 19.4 - 2. Which metal in the following list is easiest to...Ch. 19.4 - Determine which of the following redox equations...Ch. 19.4 - A lithium ion battery produces a voltage of 3.6 V....Ch. 19.4 - Use the energy produced by the combustion of...Ch. 19.4 - What mass of lithium ion batteries would produce...Ch. 19.5 - A voltaic cell is set up with an aluminum...Ch. 19.5 - Check Your Understanding The half-cells Fe2+(aq,...Ch. 19.5 - 1. Calculate Ecell at 298 K for a cell involving...Ch. 19.6 - The following reaction has an E value of 0.76 V:...Ch. 19.6 - Calculate the equilibrium constant at 25 C for the...Ch. 19.6 - 1. 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