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Explain Faraday’s First Law of Electrolysis

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Faraday’s first law quantifies the relationship between the quantity of electricity and the amount of material involved in electrolysis.
Updated On: Jan 13, 2026
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Solution and Explanation

Faraday's First Law of Electrolysis

The mass of a substance deposited or liberated at an electrode during electrolysis is directly proportional to the quantity of electricity passed through the electrolyte.

This relationship is mathematically represented as: \[ m = \frac{M \cdot I \cdot t}{F} \] where:
  • \( m \) represents the mass of the deposited or liberated substance,
  • \( M \) is the substance's molar mass,
  • \( I \) denotes the current in amperes,
  • \( t \) signifies the time in seconds,
  • \( F \) is Faraday's constant (\( 96500 \) C mol\(^{-1}\)).
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