What is Faraday constant and its application

Faraday constant

Faraday Constant definition

Definition of Faraday constant is the amount of electric charge carried by one mole or Avogadro’s number of electrons. Faraday constant is denoted by ‘F’. This constant was named after Michael Faraday. The most common use of this Faraday constant has been made in the electrolysis.

Faraday constant formula

Faraday constant can be expressed by

 F= eNA   = F= 96485 c mol-1

Where, F= Faraday Constant

E = It is the charge of the electron in coulombs = 1.602176634 X 10-19 C

NA is the Avogadro’s constant = 6.02214086 X 1023 mol-1

What is Avogadro’s constant

Avogadro’s number is the number of units in one mole of a substance. This number is also called the Avogadro constant. The value of Avogadro’s constant is 6.02214086 X 1023 mol-1

Faraday’s constant in Joules

Faraday’s constant value can be expressed by using this unit

F= 96485 Joule per volt gram equivalent

How to use Faraday’s constant

One of the most common uses of this Faraday’s constant has been made in electrolysis calculation. Dividing the amount of charge in coulombs by the Faraday’s constant gives the amount in moles of elements that have been oxidized.

How Faraday’s constant is a universal constant?

Faraday represents the amount of electric charge carried by one mole or Avogadro’s number of electrons. It can be derived by dividing the Avogadro’s constant or the number of electrons per mole by the number of electrons per coulomb.

We can see when it is derived it does not depend upon any such factors. So it is not changed at any time. That is why it is a universal constant.

Write the equivalent value of this constant in another unit in table form

Equivalent value Units
96485.33289 Coulombs per mol (C mol-1)
96485 Joule per volt gram equivalent J/V
23.061 Kcal per volt gram equivalent (Kcal/v)
26.801 A.h/mol

Applications of Faraday constant

Faraday’s constant represents the amount of electric charge carried by one mole of electrons. This charge is usually used in electrochemistry for electrolysis calculation. This constant is used in chemistry and physics also.

Dividing the amount of charge in Coulombs by the Faraday constant gives the amount in moles of elements that have been oxidized. The Faraday constant is also used across understanding the oxygen flow rate and charge transfer etc.

Q&A

1. What is Faraday constant?

Faraday constant is the amount of electric charge carried by one mole or Avogadro’s number of electrons. It is denoted by “F”.

2. What is the value of the Faraday constant

The value of the Faraday constant is 96,485 c/mol which is 1 F corresponding to the amount of electricity that is carried by 1 mol of electrons.

3. What is Faraday’s constant in chemistry?

Faradays consant is the total electric charge carried by Avogardo’s number

Therefore, F= eNA

= {(1.602 X 10-19) X (6.022 X 1022)}

= 9648 C mol-1

Where, e = The charge of the electron in Coulombs

NA = It is the Avogadro Constant

So, we can easily calculate Faraday’s constant by multiplying the charge of an electron by the Avogadro constant.