alleryStart learning →About what fraction of acetic acid molecules are in the ionized form in water under typical conditions?
AAlmost all of them
BAbout half of them
CAbout ten per cent
DAbout one per cent
Answer & Solution
Correct answer: D. About one per cent
1. Acetic acid is a weak acid, so it reacts only partly with water.
2. Under typical conditions about 1% of the molecules are present as the acetate ion.
3. The remaining 99% stay as intact acetic acid molecules.
4. A double arrow in the equation marks this partial reaction.
5. A strong acid such as HCl would instead react essentially completely.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.2 Classifying Chemical Reactions_
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