Atlas of Fundamental Concepts

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Canonical static concept record

Ionic strength

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Summary

The charge-squared weighted concentration measure I=12βˆ‘icizi2I=\tfrac12\sum_i c_i z_i^2 for ions in a solution under a stated concentration convention.

Record metadata

Canonical name
Ionic strength
Concept ID
ionic_strength
Content version
2.3.0
Primary field
Chemistry
Fields
Chemistry
Primary domain
Solutions, acids, bases & interfaces
Domains
Solutions, acids, bases & interfaces, Electrochemistry
Alternate terminology
No alternate terminology is currently authored for this record.
Concept type
Charge-weighted solution composition

Concept sources

Incoming relations (arrows to this concept)

Each relation below ends at this concept.

Electrolyte solutionIonic strength

Permalink to relation

This is an authored directed relation from the source endpoint to the target endpoint.

Relation ID
chem_electrolyte_solution_to_ionic_strength_state_description
Relation type
State / property description state-description
Direction
source β†’ target
Endpoint roles
source: Has state / property description; target: State / property description of
Authored annotation
has charge-weighted composition

Authored explanation

The ionic strength of an electrolyte solution depends on the concentrations and charges of all dissolved ions, including ions from background electrolyte and acid-base or complexation equilibria.

How to interpret this relation type

The target represents a state, property, observable, or state-dependent description associated with the source system or theory.

Relation sources

Outgoing relations (arrows from this concept)

Each relation below starts at this concept.

Ionic strengthActivity coefficient

Permalink to relation

This is an authored directed relation from the source endpoint to the target endpoint.

Relation ID
chem_ionic_strength_to_activity_coefficient_describes_governs
Relation type
Describes / governs describes-governs
Direction
source β†’ target
Endpoint roles
source: Describes / governs; target: Described / governed by
Authored annotation
controls a leading nonideality variable

Authored explanation

Ionic strength is a central variable in dilute-solution activity-coefficient models, but solvent composition, ion size, specific interactions, temperature, and model range also matter.

How to interpret this relation type

A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.

Relation sources