Faraday’s laws of electrolysis

https://doi.org/10.1351/goldbook.09075
Faraday’s First Law of electrolysis: Mass \(m\) of electrochemically-transformed substance is proportional to the charge \(Q\) passed, \(m\! \propto\! Q\). Faraday’s Second Law of electrolysis: When the same electric charge (quantity of electricity) \(Q\) is passed through several electrolytes, the mass \(m_{\rm{i}}\) of the substances deposited are proportional to their respective chemical equivalent molar mass, \(M_{\rm{i}}/z_{\rm{i}}\). \[m_{1}/m_{2} = (M_{1}/z_{1})/(M_{2}/z_{2})\]
Notes:
  1. The relationship may be formulated as \(m=MQ/zF\), where \(M\) is the molar mass of the substance, \(z\) the number of electrons transferred (see: electron number of an electrochemical reaction), and \(F\) is the Faraday constant.
  2. Measurement of charge using a coulometer relies on Faraday’s Law.
  3. If reference is made only to ‘Faraday’s Law of electrolysis’ the first law is meant.
Source:
PAC, 2020, 92, 641. 'Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)' on page 653 (https://doi.org/10.1515/pac-2018-0109)