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Electrolysis & Faraday's Laws
AP Chemistry · Unit 9 Electrochemistry
Learning Objectives
Apply Faraday's law: moles = It/(nF)
Calculate mass of substance deposited
Relate current, time, and charge transfer
Identify cathode (reduction) and anode (oxidation)
Key Equations
Q = I × t (charge in coulombs)
mol e⁻ = Q / F
F = 96,485 C/mol e⁻
mol product = mol e⁻ / n
mass = mol × M (molar mass)
Tags
electrolysis
Faraday
electrochemistry
plating
ELECTROLYTE
CuSO₄ → Cu plating (n=2)
AgNO₃ → Ag plating (n=1)
NaCl(molten) → Na + Cl₂ (n=1/2)
Al₂O₃ → Al smelting (n=3)
Current I (A)
2.0
Time (min)
60
Charge Q
—
mol e⁻
—
mol product
—
Mass deposited
—