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the claim

Pure solids and pure liquids are excluded from the expression for the equilibrium constant.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
8 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

AS REPORTEDno primary record reached; this is what the reporting says

Is it true that pure solids and pure liquids are excluded from the expression for the equilibrium constant?

Yes. Pure solids and pure liquids have activities of 1 and are therefore omitted from equilibrium constant expressions.

Verdict: SUPPORTED · 8 sources for, 0 against · Last checked

How claims like this are judged

Judged against reference works: claims of this kind are settled by reference works, not journal abstracts.

Evidence for · 8
Wikipedia: Equilibrium constant
Reference article covering this claim directly
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Wikipedia: Equilibrium constant. (n.d.). Wikipedia. https://en.wikipedia.org/wiki/Equilibrium_constant

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More for · 7
Wikipedia: Chemical equilibrium
Reference article covering this claim directly
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Wikipedia: Chemical equilibrium. (n.d.). Wikipedia. https://en.wikipedia.org/wiki/Chemical_equilibrium

LibreTexts: LibreTexts: 15.S: Chemical Equilibrium (Summary)
States that if a pure solid or liquid is involved, its concentration is excluded.
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LibreTexts: LibreTexts: 15.S%3A Chemical Equilibrium (Summary). (n.d.). LibreTexts. https://chem.libretexts.org/Courses/University_of_Missouri/MU%3A__1330H_(Keller)/15%3A_Chemical_Equilibrium/15.S%3A_Chemical_Equilibrium_(Summary)

OpenStax: OpenStax Chemistry: 13.2 Equilibrium Constants
Explains solids and pure liquids do not appear in equilibrium constant expressions.
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OpenStax: OpenStax Chemistry: 13.2 Equilibrium Constants. (n.d.). OpenStax. https://openstax.org/books/chemistry/pages/16677ba1-b431-48db-87a7-93cb9fae9806@

Wikibooks: Wikibooks: General Chemistry/Chemical Equilibria/Equilibrium
Activity is 1 for pure solids and liquids, so they are not written in the expression.
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Wikibooks: Wikibooks: General Chemistry/Chemical Equilibria/Equilibrium. (n.d.). Wikibooks. https://en.wikibooks.org/wiki/General_Chemistry/Chemical_Equilibria/Equilibrium

LibreTexts: LibreTexts: 4.03: Gas Phase Equilibria and Heterogeneous Systems
Notes that solids and pure liquids do not appear in equilibrium constant expressions.
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LibreTexts: LibreTexts: 4.03%3A Gas Phase Equilibria and Heterogeneous Systems. (n.d.). LibreTexts. https://chem.libretexts.org/Courses/College_of_the_Canyons/CHEM_202%3A_General_Chemistry_II_OER/04%3A_Chemical_Equilibrium/4.03%3A_Gas_Phase_Equilibria_and_Heterogeneous_Systems

OpenStax: OpenStax Chemistry: Atoms First: 13.2 Equilibrium Constants
Confirms solids and pure liquids do not appear in equilibrium constant expressions.
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OpenStax: OpenStax Chemistry: Atoms First: 13.2 Equilibrium Constants. (n.d.). OpenStax. https://openstax.org/books/chemistry-atoms-first/pages/869fa880-bae2-4a92-97c9-4a89f32c7855@

Wikibooks: Wikibooks: General Chemistry/Print version
Activity is 1 for pure solids and liquids, so they do not need to be written.
Get citation
Wikibooks: Wikibooks: General Chemistry/Print version. (n.d.). Wikibooks. https://en.wikibooks.org/wiki/General_Chemistry/Print_version

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