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· Last updated：2026-09-02
m = M·I·t/(n·F) with unit selectors for current and time: charge passed, moles of electrons, and the mass deposited.
Execution
Fill in the form, run the tool, and review the result in one place.
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Tool usage guide
The Faraday Electrolysis Calculator computes the mass of substance deposited or liberated during electrolysis using Faraday's first and second laws (m = M·I·t/(n·F)). By inputting molar mass, current, duration, and the number of electrons transferred per ion, you can instantly determine total electric charge, moles of transferred electrons, and theoretical mass yield.
Background
A technician runs an acid copper bath (Cu²⁺) for an electroforming workpiece.
Problem
Calculate how much copper is deposited when running a steady 2 A current for 1 hour.
How to use
Set Molar Mass to 63.546 g/mol, Current to 2 A, Time to 1 h, and Electrons per ion (n) to 2.
Outcome
Calculates 7,200 C total charge passed (0.0746 mol e⁻) resulting in 2.371 g of deposited copper.
Background
A student needs to verify charge transfer using silver nitrate solution where Ag⁺ accepts 1 electron.
Problem
Determine the mass of silver deposited after passing 1 A of current for 15 minutes.
How to use
Set Molar Mass to 107.868 g/mol, Current to 1 A, Time to 15 min, and Electrons per ion (n) to 1.
Outcome
Calculates 900 C total charge (0.00933 mol e⁻) yielding 1.006 g of deposited silver.
It uses Faraday's law of electrolysis: m = (M × I × t) / (n × F), where M is molar mass, I is current, t is time in seconds, n is valence number, and F is Faraday's constant (~96,485 C/mol).
The calculator uses the standard Faraday constant of approximately 96,485.33 C/mol, representing the electric charge per mole of electrons.
The variable 'n' represents the number of electrons transferred per ion during the redox reaction (for example, n = 2 for Cu²⁺ or n = 1 for Ag⁺).
No, the calculator yields the theoretical 100% Faradaic yield. Actual deposited mass in practical cells may be lower due to secondary reactions.
Current can be specified in amperes (A) or milliamperes (mA), and duration can be set in seconds (s), minutes (min), or hours (h).