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K Is Dimensionless

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State

An equilibrium constant is treated as dimensionless, since each concentration or pressure term is really a ratio to a reference standard state that cancels its units.

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Chemists report K = 4.2, not K = 4.2 mol²/L², even though concentrations carried units when substituted.

Watch for

Attaching units to a reported K value misrepresents the activity-based convention behind the expression.

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