Acetic acid, also called acetic acid, with chemical formula of CH3COOH, is an organic monobasic acid and the main component of vinegar. Pure anhydrous acetic acid (glacial acetic acid) is a colorless hygroscopic liquid with a freezing point of 16.6℃(62_). After solidification, it is colorless crystal. Its aqueous solution is weakly acidic, corrosive and corrosive to metals. Steam irritates eyes and nose.