activity coefficient, f , γ

The activity coefficient $f B$ of a substance B in a liquid or solid mixture containing mole fractions $x B$ , $x C$ , ... of the substances B, C, ... is a dimensionless quantity defined in terms of the chemical potential $μ B$ of B in the mixture by:

$R T ln ( x B f B ) = μ B cd T P x − μ B * cd T p$

where $x$ denotes the set of mole fractions $x B$ , $x C$ , ... . The activity coefficient $γ B$ of a solute B in a solution (especially a dilute liquid solution) containing molalities $m B$ , $m C$ , ... of solutes B, C, ... in a solvent A is a dimensionless quantity defined in terms of the chemical potential $μ B$ by:

$R T ln ( m B γ B m ⊖ ) = μ B − μ B − R T ln ( m B m ⊖ ) ∞$

Source:

PAC, 1994, 66, 533 (Standard quantities in chemical thermodynamics. Fugacities, activities and equilibrium constants for pure and mixed phases (IUPAC Recommendations 1994)) on page 543

PAC, 1994, 66, 533 (Standard quantities in chemical thermodynamics. Fugacities, activities and equilibrium constants for pure and mixed phases (IUPAC Recommendations 1994)) on page 546

PAC, 1990, 62, 2167 (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2171

PAC, 1996, 68, 957 (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 960

activity coefficient, ,

activity coefficient, $f$ , $γ$