How this calculator works
Faraday law converts useful electric charge into moles of product according to the balanced half-reaction. Current times duration gives total charge; current efficiency is the fraction producing the target material. Product presets explicitly name the assumed oxidation state, while custom mode accepts your own molar mass and electron count. Choosing a product does not establish that it can be deposited from a particular solvent. Competing reactions, transport limits and changing current need separate experimental treatment.
Formula
Q = I t; m = efficiency Q M/(z F). F = NA e = 96485.33212331002 C/mol. M is converted from g/mol to kg/mol.
Worked example
For a custom 100 g/mol product requiring one electron, one Faraday at 100% efficiency produces 100 g. A 50 g/mol product requiring two electrons produces 25 g from the same charge.
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Frequently asked questions
What does current efficiency mean?
It is the fraction of charge producing the specified product, rather than side reactions.
Which iron ion is assumed?
The iron preset uses Fe3+ to Fe, requiring three electrons. Use custom mode for Fe2+.
Can electron count inferred from measurements be fractional?
The inverse result is an apparent count affected by measurement error. A balanced half-reaction itself uses integer electrons.