Faraday's First Law of Electrolysis

📊 intermediate

$$m = ZIt$$

States that the mass of a substance deposited at an electrode is proportional to the quantity of electricity passed.

Variables & Units

$m$

Mass of substance deposited

Unit: Gram ($g$)

$Z$

Electrochemical equivalent

Unit: $g/C$

$I$

Current

Unit: Ampere ($A$)

$t$

Time

Unit: Second ($s$)

Key Information

📐 Derived From

The relationship between charge and chemical change.

💡 Example

Mass of copper electroplated in 1 hour with a 2A current.

🔧 Applications

Electroplating and metal purification.

⚠️ Constraints

Assumes 100% current efficiency.

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