alleryStart learning →Acetic acid, CH3CO2H, constitutes approximately what percentage of ordinary vinegar?
A10-15%
B3-6%
C25-30%
D50%
Answer & Solution
Correct answer: B. 3-6%
1. Vinegar is a dilute aqueous solution of acetic acid, not concentrated acid.
2. The text states: "Acetic acid, CH3CO2H, constitutes 3–6% vinegar."
3. The remaining 94-97% of vinegar is essentially water and trace flavour compounds, not more acetic acid.
4. So acetic acid makes up roughly 3-6% of vinegar by content, not the much higher percentages in the other options.
_Source: OpenStax Chemistry Ch 20 "Organic Chemistry", p.1125 §20.3 Aldehydes, Ketones, Carboxylic Acids, and Esters_
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