Glacial Acetic Acid, also known as ethanoic acid is an organic compound with the chemical formula of CH3COOH. It is the main component of vinegar, which is typically made between 5% and 10% concentration mixed with water. It has a distinctive sour taste and pungent smell. Acetic acid is used widely for descaling, as a chemical reagent and as a food additive. In household uses it is often used in foods and cooking. Glacial acetic acid Freezes at 62°F. In lower concentrations with water, the freezing point lowers to below the freezing point of water. As the solution becomes more heavily concentrated with water, it will freeze close to 32°F. 99.85+% Concentration, Freezes at 62°F