Chemistry / Unit 10 Chem 1847 short lesson, about 20 seconds
Percent Ionization Defined
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The idea
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.
In practice
A 1.0 M and a 0.010 M solution of the same weak acid show different percent ionizations despite sharing one Ka.
Where people slip
Percent ionization is not the acid's strength ranking — Ka is the concentration-independent measure.
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