What does ethanoate mean?
An ethanoate is any salt or ester of ethanoic acid, the compound that gives vinegar its sour taste, as well as the negatively charged ion (CH₃COO⁻) that such compounds contain. When ethanoic acid loses its acidic proton, the remaining CH₃COO⁻ ion pairs with a metal to form salts like sodium ethanoate, or bonds to an organic group to form esters like ethyl ethanoate, a common industrial solvent. The word is the systematic name sanctioned by IUPAC, the international body that standardizes chemical nomenclature, though the older, informal name "acetate" remains dominant in everyday usage, industry, and much of the scientific literature. Learners encounter "ethanoate" most often in chemistry courses, particularly in Britain, where syllabuses emphasize systematic names over traditional ones. Knowing both terms matters: a bottle labeled "sodium acetate" and one labeled "sodium ethanoate" contain exactly the same substance.
nounAny salt or ester of ethanoic (acetic) acid, containing the anion CH₃COO⁻; also the anion itself. It is the preferred IUPAC systematic name for what is more commonly called acetate.
- The negatively charged anion CH₃COO⁻ derived from ethanoic acid by loss of a proton.
- Any salt or ester formed from ethanoic acid and a metal or organic group.
"The reaction of ethanoic acid with sodium hydroxide yields sodium ethanoate and water."
"Sodium ethanoate is a common laboratory reagent used in buffer solutions."
"Ethyl ethanoate, better known as ethyl acetate, is widely used as a solvent in nail polish remover."
The plural refers collectively to multiple distinct ethanoate salts or esters rather than multiple ions.
"Metal ethanoates are generally soluble in water."
Vinegar's conjugate base has two names — 'acetate' if you're casual, 'ethanoate' if you're speaking strict IUPAC.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ethanoate
The word "ethanoate" is built from "ethane," the two-carbon alkane, combined with the suffix "-oate," which IUPAC uses for salts and esters of carboxylic acids. The root traces back through German chemical nomenclature to the Greek "aithēr," meaning "upper air" or "ether." As a formal systematic term it belongs to the modern era of standardized chemical naming, gaining currency in the twentieth century as IUPAC rules were adopted, alongside its older synonym "acetate," which derives from Latin "acetum," meaning vinegar.
Related word forms
How ethanoate is actually used
"Ethanoate" is chiefly a term of formal chemistry — found in textbooks, nomenclature rules, and exam papers under IUPAC conventions. In everyday speech, industry, and most older literature, "acetate" is far more common; British educational contexts tend to favor "ethanoate" more than American ones do.
Easily confused with ethanoate
Ethanoic acid (CH₃COOH) is the acid itself, while an ethanoate is its salt, ester, or deprotonated anion.
Ethanol is drinking alcohol (C₂H₅OH), whereas ethanoate is a salt or ester derived from ethanoic acid.