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Propionic acid. Propionate is similar, but with one hydrogen ion removed.

The propionate (IUPAC name propanoate) ion is C2H5COO (propionic acid minus one hydrogen ion).

A propionate or propanoate compound is a salt or ester of propionic acid.

Propionates/propanoates should not be confused with propenoates, the ions/salts/esters of propenoic acid (also known as 2-propenoic acid or acrylic acid).