... smell. Pure, water-free acetic acid (glacial acetic acid) is a Acetic acid, CH3COOH, also known as ethanoic acid, is an which gives its sour ... taste and pungent smell. Pure, -free acetic acid (glacial acetic acid) is a colourless that absorbs water from the environment (), and freezes ... 16.7 (62 ) to a colourless . It is a , in that it is only partially acid in .Acetic acid is one of the simplest ...