Debye–Hückel theory
E518985
Debye–Hückel theory is a foundational model in physical chemistry that explains how electrostatic interactions between ions in solution affect properties such as activity coefficients and equilibrium behavior in electrolytes.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
electrolyte solution model
ⓘ
physical chemistry theory ⓘ |
| appliesTo | dilute electrolyte solutions ⓘ |
| assumes |
continuum dielectric solvent
ⓘ
linearized Poisson–Boltzmann equation ⓘ point-like ions ⓘ thermal equilibrium ⓘ |
| basedOn |
Coulomb’s law
NERFINISHED
ⓘ
Poisson–Boltzmann equation NERFINISHED ⓘ |
| coreConcept |
electrostatic screening
ⓘ
ionic atmosphere ⓘ ionic strength dependence of activities ⓘ mean activity coefficient ⓘ |
| describes |
activity coefficients of ions
ⓘ
electrostatic interactions between ions in solution ⓘ ionic atmosphere around an ion ⓘ mean ionic activity coefficient ⓘ non-ideality of electrolyte solutions ⓘ screening of electrostatic interactions in electrolytes ⓘ |
| explains |
dependence of activity coefficients on ionic strength
ⓘ
deviation from ideal solution behavior in electrolytes ⓘ |
| field |
electrochemistry
ⓘ
physical chemistry ⓘ solution chemistry ⓘ |
| hasFormulation |
Debye–Hückel limiting law
NERFINISHED
ⓘ
extended Debye–Hückel equation ⓘ |
| hasLimitation |
assumes uniform dielectric constant
ⓘ
neglects finite ion size ⓘ neglects ion-specific short-range interactions ⓘ valid only at low ionic strength ⓘ |
| influenced |
development of Pitzer equations
ⓘ
extended electrolyte models ⓘ |
| introduces |
Debye parameter kappa
NERFINISHED
ⓘ
Debye screening length NERFINISHED ⓘ ionic strength concept ⓘ |
| namedAfter |
Erich Hückel
NERFINISHED
ⓘ
Peter Debye NERFINISHED ⓘ |
| predicts |
activity coefficient decreases with increasing ionic strength at low ionic strength
ⓘ
logarithm of activity coefficient proportional to square of ion charge ⓘ |
| relatedTo |
Bjerrum ion-pair theory
NERFINISHED
ⓘ
Gouy–Chapman theory NERFINISHED ⓘ Pitzer model NERFINISHED ⓘ Poisson–Boltzmann theory NERFINISHED ⓘ |
| usedFor |
calculating activity coefficients in electrolyte solutions
ⓘ
estimating mean ionic activity coefficients from ionic strength ⓘ interpreting equilibrium constants in ionic solutions ⓘ interpreting solubility of electrolytes ⓘ modeling acid–base equilibria in ionic media ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.