Massa depositada (Faraday)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The 'Mass Deposited (Faraday)' calculator applies Faraday's Law to determine the mass of an element deposited during electrolysis. It uses the formula m = (I × t × M) / (n × F), where I is current in amperes, t is time in seconds, M is molar mass, and n is the number of electrons transferred in the reaction. This tool is crucial in electrochemistry for processes like electroplating or metal refining.
The formula accounts for total electric charge (Q = I × t) and Faraday's constant (F ≈ 96,485 C/mol), linking charge to substance quantity. To use it, input correct values for current, time, molar mass, and electrons. The result is the theoretical deposited mass, useful in labs and industries working with electrolysis.
Practical examples include determining silver deposited in jewelry, copper in electronics, or aluminum in refining. Important considerations: verify units (ampere-seconds in coulombs), confirm the correct number of electrons (n) for the specific reaction, and ensure electrolyte purity. The result is a theoretical estimate; practical efficiency may vary due to losses.
Faraday's constant (F) is fixed, but molar mass (M) and electron count (n) depend on the element and chemical reaction. For elements with multiple oxidation states, n changes with the reaction. The calculator assumes ideal conditions; in real environments, factors like temperature and electrolyte concentration may affect results.
Frequently asked questions
What units should I use for current and time?
Use amperes (A) for current and seconds (s) for time. The formula requires electric charge (Q = I × t) in coulombs (C).
How do I determine the number of transferred electrons (n)?
Refer to the balanced electrochemical reaction. For instance, in Cu²⁺ reduction to Cu, each ion gains 2 electrons, so n = 2.
Why is molar mass important?
Molar mass (M) represents the mass of one mole of the element. Without it, the charge-to-atom ratio cannot be calculated.
Does the calculator work if current is not constant?
No, the formula assumes constant current. For variable current, integrate I(t) over time or use average approximations.
Do I need to convert mass to grams?
Yes, the result will be in grams if molar mass is in g/mol. Adjust units as needed for your application.