Acetic acid is commonly referred to as ethanoic acid and it is colorless liquid and an organic compound that has a chemical formula of CH3COOH. If the acid is undiluted, it can be referred to as glacial acetic acid. Acetic acid makes up around 7% of vinegar which means that it is the main component of vinegar with the exception of water. Acetic acid comes with a very sour taste and a pungent smell as well. While the main use for acetic acid comes in vinegar, you’re going to find that it also has other uses and is a precursor to both cellulose acetate and polyvinyl acetate. It is technically classified as a weak acid but if it is concentrated, it can be corrosive and it can affect the skin.