the univalent anion HCO₃⁻; any salt of carbonic acid in which only one of the hydrogen atoms has been replaced.
sodium bicarbonate used as a mild antacid; bicarbonate of soda
A weak unstable acid, H₂CO₃, known only in solution, and as carbonate salts; it is present in carbonated drinks, and sparkling wine, but decomposes to form carbon dioxide and water.