is a transparent, colorless liquid with a characteristic, mild smell. In dilute aqueous solution, it has a slightly sweet flavor, however in more concentrated solutions it has a burning taste. Ethanol, CH3CH2OH, is an alcohol, a group of chemical compounds whose molecules hold a hydroxyl group, -OH, bonded to a carbon atom. The word alcohol evolve from Arabic al-kuhul, which signify a fine powder of antimony fabricated by distilling antimony and employed as an eye makeup. Alcohol primarily referred to any fine powder, nevertheless medieval alchemists later applied the term to the refined products of distillation, and this led to the present usage.