standard equilibrium constant

symbols: $K^{\circ}$, $K$
synonym: thermodynamic equilibrium constant
https://doi.org/10.1351/goldbook.S05915
Quantity defined by \(K^{\,\unicode{x26ac}} = \rm{e}^{-\Delta _{\rm{r}}G^{\,\unicode{x26ac}}/R\ T}\) where \(\Delta _{\rm{r}}G^{\,\unicode{x26ac}}\) is the standard reaction Gibbs energy, \(R\) the gas constant and \(T\) the thermodynamic temperature. Some chemists prefer the name thermodynamic equilibrium constant and the symbol \(K\).
Source:
Green Book, 2nd ed., p. 50 [Terms] [Book]
See also:
PAC, 1994, 66, 533. (Standard quantities in chemical thermodynamics. Fugacities, activities and equilibrium constants for pure and mixed phases (IUPAC Recommendations 1994)) on page 548 [Terms] [Paper]
Citation: 'standard equilibrium constant' 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.S05915 RIS BibTex EndNote
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