Chapter 18, Problem 18.110QP

(a)

Interpretation Introduction

Interpretation:

The diagrammatic representation of the given electrolytic cell has to be given and the time required for the completion of electrolysis has to be calculated.

Concept Introduction:

• Electrolysis is the process in which the electric current is used for the initiation of a non-spontaneous reaction.  The process is widely used for the separation of elements from a mixture or ore.  The process of electrolysis is carried out in an electrolytic cell.  Electroplating is one of the important application of electrolysis.  In electroplating electric current is used to deposit the metal ions from the solution to the electrode surface.
• The amount of electrical charge that is passing through a circuit depends upon the amount and time of the flow of current.  The electrical charge is measured in Coulomb.

$\text{Q=}\frac{\text{I}}{\text{t}}$

Where,

$\text{Q}$ is the charge in Coulomb

$\text{I}$ is the current in Ampere

$\text{t}$ is the time in second

• Faradays First law of electrolysis says that the quantity of substance deposited on an electrode is proportional to the charge passed through the solution.

$\text{m = Z}\times \text{Q}$

Where,

$\text{m}$ is the amount of substance liberated

$\text{Q}$ is the quantity of charge passed

$\text{Z}$ is the electrochemical equivalence of the substance

• Mole is the mass of the substance that is having Avogadro number of particles.  The number of moles of a given substance can be calculated by dividing its weight to molecular weight.

(b)

Interpretation Introduction

Interpretation:

The diagrammatic representation of the given electrolytic cell has to be given and the time required for the completion of electrolysis has to be calculated.

Concept Introduction:

• Electrolysis is the process in which the electric current is used for the initiation of a non-spontaneous reaction.  The process is widely used for the separation of elements from a mixture or ore.  The process of electrolysis is carried out in an electrolytic cell.  Electroplating is one of the important application of electrolysis.  In electroplating electric current is used to deposit the metal ions from the solution to the electrode surface.
• The amount of electrical charge that is passing through a circuit depends upon the amount and time of the flow of current.  The electrical charge is measured in Coulomb.

$\text{Q=}\frac{\text{I}}{\text{t}}$

Where,

$\text{Q}$ is the charge in Coulomb

$\text{I}$ is the current in Ampere

$\text{t}$ is the time in second

• Faradays First law of electrolysis says that the quantity of substance deposited on an electrode is proportional to the charge passed through the solution.

$\text{m = Z}\times \text{Q}$

Where,

$\text{m}$ is the amount of substance liberated

$\text{Q}$ is the quantity of charge passed

$\text{Z}$ is the electrochemical equivalence of the substance

• Mole is the mass of the substance that is having Avogadro number of particles.  The number of moles of a given substance can be calculated by dividing its weight to molecular weight.