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Activity coefficient

In thermodynamics, an activity coefficient is a factor used to account for deviation of a mixture of chemical substances from ideal behaviour. In an ideal mixture, the microscopic interactions between each pair of chemical species are the same (or macroscopically equivalent, the enthalpy change of solution and volume variation in mixing is zero) and, as…

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Thermodynamic definition

Chemical potentialIdeal solutionMole fractionHenry's lawSolvent
20 related topics

Theoretical calculation of activity coefficients

Debye–Hückel equationDavies equationPitzer equationsSpecific ion interaction theoryUNIQUAC
17 related topics

Application to chemical equilibrium

Gibbs free energyReactantDetermined
3 related topics

Overview

ThermodynamicsMixtureChemical substancesIdeal mixtureChemical species
15 related topics

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Overview

Thermodynamic definition

Experimental determination of activity coefficients

Theoretical calculation of activity coefficients

Dependence on state parameters

Application to chemical equilibrium

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Map overview Semantic statistics

Activity coefficient

Nodes66
Edges65
Triples58
Avg. degree1.97
Density0.030303
Components1

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Activity coefficient

Top relations

related to Theoretical calculation of activity coefficients · 14
Activity coefficient → Activity, COSMO-RS, Davies, Debye, For, Hückel, MOSCED, NRTL, Pitzer, SIT, Specific, TCPC, UNIFAC, UNIQUAC
related to Ionic solutions · 6
Activity coefficient → Additionally, For, In, It, Knowledge, Single
related to Experimental determination of activity coefficients · 5
Activity coefficient → Activity, Henry's, Other, Raoult's, Use
related to Concentrated ionic solutions · 4
Activity coefficient → Debye, Hückel, Ionic, The
related to At infinite dilution · 3
Activity coefficient → Activity, Because, Examples
related to External links · 3
Activity coefficient → AIOMFAC, An, Electrochimica Acta Single-ion
related to Link to ionic diameter · 3
Activity coefficient → Debye, Hückel, The
related to Dependence on state parameters · 2
Activity coefficient → Similarly, The
is a · 1
Activity coefficient → factor used to account for deviation of a mixture of chemical substances from ideal behaviour
has method · 1
Activity coefficient → Activity

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Important terminology

activity coefficients coefficient displaystyle mathrm electrolyte ion equilibrium activities ideal model ionic water gamma law chemical may constant mixtures mixture

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Activity coefficientis afactor used to account for deviation of a mixture of chemical substances from ideal behaviour0.90text
Raoult's lawinstance ofand hence allows expressions0.80text
equilibrium constants to be applied to both idealinstance ofand hence allows expressions0.80text
non-ideal mixtures.Ionic solutionsKnowledge of activity coefficients is particularly important in the context of electrochemistry since the behaviour of electrolyte solutions is often far from idealinstance ofand hence allows expressions0.80text
even starting at low densities due to the effects of the ionic atmosphereinstance ofand hence allows expressions0.80text
the Davies equationinstance ofHückel equation or extensions0.80text
Pitzer equations or TCPC modelinstance ofHückel equation or extensions0.80text
UNIQUACinstance ofmay also be used.For non-electrolyte solutions correlative methods0.80text
NRTLinstance ofmay also be used.For non-electrolyte solutions correlative methods0.80text
MOSCED or UNIFAC may be employedinstance ofmay also be used.For non-electrolyte solutions correlative methods0.80text
provided fitted component-specific or model parameters are availableinstance ofmay also be used.For non-electrolyte solutions correlative methods0.80text
CO2instance ofdissolved undissociated gases0.80text

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