Kohlrausch law of independent migration of ions

E635554

The Kohlrausch law of independent migration of ions states that at infinite dilution, each ion contributes a characteristic, additive amount to the total molar conductivity of an electrolyte solution, independent of the other ions present.

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Statements (45)

Predicate Object
instanceOf law in electrochemistry ⓘ
physical law ⓘ
alsoKnownAs Kohlrausch’s law ⓘ
Kohlrausch’s law of independent ionic migration ⓘ
appliesTo aqueous electrolyte solutions ⓘ
binary electrolytes ⓘ
multi-ionic electrolytes at infinite dilution ⓘ
strong electrolytes ⓘ
appliesUnderCondition infinite dilution ⓘ
assumes ions do not interact with each other at infinite dilution ⓘ
transport numbers are constant at infinite dilution ⓘ
concernsConcept independent ionic migration ⓘ
concernsProperty ionic molar conductivity at infinite dilution ⓘ
concernsQuantity limiting molar conductivity ⓘ
molar conductivity ⓘ
concernsSpecies anions ⓘ
cations ⓘ
field electrochemistry ⓘ
physical chemistry ⓘ
hasConsequence ionic contributions to conductivity can be tabulated as constants ⓘ
limiting molar conductivity of strong electrolytes increases with dilution ⓘ
implies limiting molar conductivity of an electrolyte is additive in ionic contributions ⓘ
isFoundationFor calculation of transference numbers from conductivity data ⓘ
limitation ionic interactions become significant at higher concentrations ⓘ
mathematicalForm Λm∞ = λ+∞ + λ−∞ for a 1:1 electrolyte ⓘ
Λm∞ = ν+ λ+∞ + ν− λ−∞ for a ν+:ν− electrolyte ⓘ
namedAfter Friedrich Kohlrausch ⓘ
notValidWhen electrolyte concentration is high ⓘ
relatedTo Debye–Hückel theory ⓘ
Onsager limiting law ⓘ
relates limiting molar conductivity of an electrolyte to limiting ionic conductivities ⓘ
requires knowledge of ionic charges and stoichiometric coefficients of the electrolyte ⓘ
statesThat at infinite dilution each ion contributes a characteristic amount to the molar conductivity of an electrolyte ⓘ
the molar conductivity at infinite dilution is the sum of independent ionic contributions ⓘ
supportsConcept additivity of ionic conductances ⓘ
usedFor calculation of individual ionic conductivities ⓘ
calculation of ionic mobilities ⓘ
determination of degree of dissociation of weak electrolytes ⓘ
determination of limiting molar conductivity of electrolytes ⓘ
verification of strong electrolyte behavior at low concentration ⓘ
usedIn analysis of conductometric data ⓘ
design of electrolyte solutions in electrochemical systems ⓘ
teaching of undergraduate physical chemistry ⓘ
validWhen electrolyte concentration approaches zero ⓘ
yearProposed late 19th century ⓘ

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Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Friedrich Kohlrausch → knownFor → Kohlrausch law of independent migration of ions ⓘ
Kohlrausch law of independent migration of ions → alsoKnownAs → Kohlrausch’s law ⓘ
linked to: Kohlrausch law of independent migration of ions
Kohlrausch law of independent migration of ions → alsoKnownAs → Kohlrausch’s law of independent ionic migration ⓘ
linked to: Kohlrausch law of independent migration of ions