Intermediate Topic 569 of 1102 Acids, Bases & Electrochemistry
Faraday's Constant
The charge on one mole of electrons, 96485 coulombs.
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In-depth explanation of Faraday's Constant
Faraday's constant F is the charge of one mole of electrons, equal to the elementary charge multiplied by Avogadro's number, with the value 96485 coulombs per mole. It converts between electrical charge and moles of electrons, which is the bridge between electricity and chemistry. One ampere is one coulomb per second, so multiplying current by time gives charge. Dividing that charge by F gives the amount of electrons transferred. This constant appears in every calculation involving electrolysis and the Nernst equation.
Going deeper: Faraday's Constant
Key ideas: F = 96485 C per mole of electrons (about 9.65e4), the charge of Avogadro's number of electrons (1.602e-19 C times 6.022e23). Use it to convert between charge and moles: n(e-) = Q/F, where Q = I x t in coulombs. It appears in delta G = -nFE and the Nernst equation.
Common mistakes and connections: Mistakes: using F per mole of substance rather than per mole of electrons, forgetting to convert minutes or hours to seconds, and mixing F with the elementary charge. Always find electrons per ion from the half-reaction first: 3 for Al3+, 2 for Cu2+, 1 for Ag+.
Visualization of Faraday's Constant
One ampere passes one coulomb per second; dividing the total charge by F = 96485 C/mol gives moles of electrons, 0.0373 mol after an hour. The interactive lesson shows this as a live animation or chart.
Worked example and use case
A current of 1 A flowing for one hour passes 3600 C, which corresponds to 0.0373 mol of electrons.
Frequently asked questions about Faraday's Constant
What is Faraday's Constant?
The charge on one mole of electrons, 96485 coulombs.
Is Faraday's Constant a beginner, intermediate or advanced topic?
Faraday's Constant is a intermediate topic in Acids, Bases & Electrochemistry. It builds on the vocabulary of beginner topics in this area.
What should I learn before Faraday's Constant?
Study these earlier topics in Acids, Bases & Electrochemistry first: Cell Potential and Free Energy, Cell Potential and Equilibrium, Concentration Cells.
What comes after Faraday's Constant?
The next topics in Acids, Bases & Electrochemistry are Faraday's First Law and Faraday's Second Law.
Can I practise Faraday's Constant with quizzes?
Yes. The interactive lesson includes a self-check question on Faraday's Constant, and the Acids, Bases & Electrochemistry quiz draws on every topic in this area.
Where Faraday's Constant fits in Acids, Bases & Electrochemistry
Faraday's Constant is topic 59 of 105 in Acids, Bases & Electrochemistry.