Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
bartleby

Concept explainers

bartleby

Videos

Question
Book Icon
Chapter 17, Problem 17.4P

(a)

Interpretation Introduction

Interpretation:

The voltage required to complete the given net reaction has to be calculated.

Concept Introduction:

When the electric current is too small, the voltage of cell is given as

E = E(cathode)-E(anode)

E(cathode) is electrode’s potential which is attached to negative terminal of current source.

E(anode) is electrode’s potential which is attached to positive  terminal of current source.

Overpotential: The activation energy of a reaction at an electrode can be overcome by voltage.  The required voltage to apply is called overpotential.

Ohmic potential:  In electrochemical cell, the electrical resistance of a solution while current I flows can be overcome by voltage.  The required voltage to apply is called ohmic potential.

Eohmic=IR

Concentration Polarization:  It is the change in concentration of products and reactants at electrode’s surface unlike they are same in solution.

(a)

Expert Solution
Check Mark

Answer to Problem 17.4P

The voltage required to complete the given net reaction is -1.906V

Explanation of Solution

To determine: The voltage required to complete the given net reaction.

When the electric current is negligible, the voltage of net reaction is given as

E = E(cathode)-E(anode)={E(cathode)-0.05916logPH20.5[OH-]}-{E(anode)-0.05916log[Br-]}={0.828 -0.059 16log(1.0)0.5[0.10]-{1.078-0.05916log[0.10]}=-1.906V

(b)

Interpretation Introduction

Interpretation:

The ohmic potential which is voltage required to overcome the resistance of cell has to be calculated.

Concept Introduction:

Ohmic potential:  In electrochemical cell, the electrical resistance of a solution while current I flows can be overcome by voltage.  The required voltage to apply is called ohmic potential.

Eohmic=IR

(b)

Expert Solution
Check Mark

Answer to Problem 17.4P

The ohmic potential which is voltage required to overcome the resistance of cell is 0.20V .

Explanation of Solution

To determine: The ohmic potential which is voltage required to overcome the resistance of cell.

The ohmic potential of the cell is calculated as follows

Eohmic=IR=(0.100A)(2.0Ω)=0.20V

(c)

Interpretation Introduction

Interpretation:

The voltage required to overcome the ohmic potential effect and electrolysis effect has to be calculated.

Concept Introduction:

When the electric current is too small, the voltage of cell is given as

E = E(cathode)-E(anode)

E(cathode) is electrode’s potential which is attached to negative terminal of current source.

E(anode) is electrode’s potential which is attached to positive  terminal of current source.

Overpotential: The activation energy of a reaction at an electrode can be overcome by voltage.  The required voltage to apply is called overpotential.

Ohmic potential:  In electrochemical cell, the electrical resistance of a solution while current I flows can be overcome by voltage.  The required voltage to apply is called ohmic potential.

Eohmic=IR

Concentration Polarization:  It is the change in concentration of products and reactants at electrode’s surface unlike they are same in solution.

(c)

Expert Solution
Check Mark

Answer to Problem 17.4P

The voltage required to overcome the ohmic potential effect and electrolysis effect is -2.17V .

Explanation of Solution

To determine: The voltage required to overcome the ohmic potential effect and electrolysis effect.

E = E(cathode)-E(anode)-I.R-overpotential=-1.906-0.20-(0.20+0.40)=-2.17V

(d)

Interpretation Introduction

Interpretation:

The voltage required to overcome the ohmic potential effect and anodic reaction overpotential has to be calculated.

Concept Introduction:

When the electric current is too small, the voltage of cell is given as

E = E(cathode)-E(anode)

E(cathode) is electrode’s potential which is attached to negative terminal of current source.

E(anode) is electrode’s potential which is attached to positive  terminal of current source.

Overpotential: The activation energy of a reaction at an electrode can be overcome by voltage.  The required voltage to apply is called overpotential.

Ohmic potential:  In electrochemical cell, the electrical resistance of a solution while current I flows can be overcome by voltage.  The required voltage to apply is called ohmic potential.

Eohmic=IR

Concentration Polarization:  It is the change in concentration of products and reactants at electrode’s surface unlike they are same in solution.

(d)

Expert Solution
Check Mark

Answer to Problem 17.4P

The voltage required to overcome the ohmic potential effect and electrolysis effect is -2.82V .

Explanation of Solution

To determine: The voltage required to overcome the ohmic potential effect and anodic reaction overpotential.

E(cathode) = Eo(cathode)-0.05916logPH20.5[OH-]=0.828 -0.059 16log(1.0)0.5[1.0]=-0.828VE(anode) = Eo(anode)-0.05916log[Br-]s=1.078 -0.059 16log(0.010)=-1.196V

From the anode voltage and cathode voltage, the voltage required to overcome the ohmic potential effect and anodic reaction overpotential is calculated as

E = E(cathode)-E(anode)-I.R-overpotential=-0.828-1.196-0.20-(0.20+0.40)=-2.82V

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Knowledge Booster
Background pattern image
Chemistry
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Text book image
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Text book image
Chemistry
Chemistry
ISBN:9781259911156
Author:Raymond Chang Dr., Jason Overby Professor
Publisher:McGraw-Hill Education
Text book image
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Text book image
Organic Chemistry
Chemistry
ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Text book image
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Text book image
Elementary Principles of Chemical Processes, Bind...
Chemistry
ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY
Electrolysis; Author: Tyler DeWitt;https://www.youtube.com/watch?v=dRtSjJCKkIo;License: Standard YouTube License, CC-BY