mass-law effect 

https://doi.org/10.1351/goldbook.M03725
At equilibrium, the product of the activities (or concentrations) of the reacting species is constant. Thus for the equilibrium: αA+βB⇌γC+δD K=[C]γ [D]δ[A]α [B]β
See also: common-ion effect, equilibrium
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1138 [Terms] [Paper]
Citation: 'mass-law effect' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.M03725 RIS BibTex EndNote
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Last revised: February 24, 2014