Equilibrium constants are defined as dimensionless quantities because they are calculated using activities or concentrations divided by standard-state reference values, canceling out any units.
Evidence for · 7
Wikipedia: Equilibrium constant
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Wikipedia: Dimensionless quantity
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Wikipedia: Gibbs free energy
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Book: Soil and Environmental Chemistry
2016 · cited by 0
Reffers to the equilibrium constant as a unitless constant.
Book: Mathematica® Computer Programs for Physical Chemistry
2012 · cited by 0
Describes the terms in equilibrium expressions as unitless quantities.
pubmed.ncbi.nlm.nih.gov: Why Equilibrium Constants Are Unitless
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The title confirms why equilibrium constants are unitless.
chemistry.stackexchange.com: Why are equilibrium constants unitless?
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Explains that terms are ratios against reference concentrations, making equilibrium constants dimensionless.