AP Chemistry · Unit 9: Thermodynamics and Electrochemistry
9.11 Electrolysis and Faraday’s Law
In short
This topic focuses on the quantitative application of Faraday's laws to electrolytic cells. You are expected to relate the macroscopic measurements of an electrolysis experiment (current, time elapsed, mass of material deposited or removed) to the particulate-level stoichiometry of the redox reaction (number of electrons transferred, charge of ionic species).
Last updated
What else do you need to know about Electrolysis and Faraday’s Law?
The core expectation is the ability to navigate between these quantities using the equation I = q/t and Faraday's constant.
Can you do these?
- I can use Faraday’s laws to determine the stoichiometry of a redox reaction with respect to the number of electrons transferred, mass of material deposited/removed, current, time elapsed, and charge of ionic species.
How is Electrolysis and Faraday’s Law tested on the exam?
Exam questions typically assess the mathematical routines required to solve electroplating or electrolysis stoichiometry problems (Suggested Skill 5.B). You may be asked to calculate the current required to plate a specific mass of metal over a given time, determine the time needed to deposit a certain mass, or calculate the mass of product formed given a steady current. Questions may also be framed in an experimental context, requiring you to critique reasoning or identify sources of error in an electroplating setup.
Free practice questions with full explanations, and instant marking of your free-response answers.
Electrolysis and Faraday’s Law: common questions
What do you need to know about Electrolysis and Faraday’s Law for AP Chemistry?
This topic focuses on the quantitative application of Faraday's laws to electrolytic cells. You are expected to relate the macroscopic measurements of an electrolysis experiment (current, time elapsed, mass of material deposited or removed) to the particulate-level stoichiometry of the redox reaction (number of electrons transferred, charge of ionic species).
How is Electrolysis and Faraday’s Law tested on the AP Chemistry exam?
Exam questions typically assess the mathematical routines required to solve electroplating or electrolysis stoichiometry problems (Suggested Skill 5.B). You may be asked to calculate the current required to plate a specific mass of metal over a given time, determine the time needed to deposit a certain mass, or calculate the mass of product formed given a steady current.
How do I know I have mastered Electrolysis and Faraday’s Law?
Check you can do each of these: use Faraday’s laws to determine the stoichiometry of a redox reaction with respect to the number of electrons transferred, mass of material deposited/removed, current, time elapsed, and charge of ionic species.
Where does Electrolysis and Faraday’s Law fit in AP Chemistry?
Electrolysis and Faraday’s Law is topic 9.11 in Unit 9: Thermodynamics and Electrochemistry of AP Chemistry.
Want help mastering this topic?
Work through Electrolysis and Faraday’s Law one-on-one with an AP Guru tutor.
Book a free demo class