Acetic Acid vs. Ethanoic Acid: Are They the Same Chemical?
Acetic acid and ethanoic acid are identical molecules: CH₃COOH, a colorless liquid with a sharp vinegar smell. “Ethanoic acid” is the IUPAC systematic name; “acetic acid” is the retained traditional name.
People stumble because textbooks and labels flip between the two. Home cooks see “acetic acid” on vinegar bottles, while chemistry homework insists on “ethanoic acid,” sparking the “Are they different?” Google spiral.
Key Differences
There are none. Same structure, same pungent bite, same preservative power. Only the naming convention changes—like calling water “dihydrogen monoxide” for laughs.
Which One Should You Choose?
Use “acetic acid” in kitchens, industry, and food labels. Reserve “ethanoic acid” for exams and peer-reviewed papers. Pick the audience, pick the name, move on.
Is vinegar pure acetic acid?
No; household vinegar is about 5 % acetic acid in water, plus traces of flavor compounds.
Can I swap names in a lab report?
Stick to one—usually ethanoic acid—to keep professors happy and grades high.