Chemistry / Chem 1847 · Atom · ~20 seconds
Percent Ionization Defined
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Percent ionization is the fraction of a weak acid's initial concentration ionized at equilibrium, and it rises as the acid is diluted even though Ka stays fixed.
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A 1.0 M and a 0.010 M solution of the same weak acid show different percent ionizations despite sharing one Ka.
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Percent ionization is not the acid's strength ranking — Ka is the concentration-independent measure.