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An acid is classified as strong when it undergoes:
ANo ionization at all
BReversible precipitation
CComplete ionization
DPartial ionization
Answer & Solution
Correct answer: C. Complete ionization
1. The classification turns on how much of the acid actually ionises in water.
2. An acid is classified as strong when it undergoes complete ionization.
3. In that case the concentration of the un-ionised acid is zero and the acid ionisation constant is immeasurably large.
4. Acids that are partially ionised are called weak, and their acid ionisation constants may be experimentally measured.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 14 'Acid-Base Equilibria', sections 14.1-14.7_
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