What is the difference between fatty acids and free acids?

Fatty acids are carboxylic acids with a long hydrocarbon chain, typically 12-22 carbon atoms, while free acids are carboxylic acids that are not attached to any other molecule. Fatty acids are found in fats, oils, and waxes, while free acids are found in a wide variety of substances, including fruits, vegetables, and vinegar.

Fatty acids are typically classified according to their chain length and degree of unsaturation. Short-chain fatty acids (SCFA) have 1-6 carbon atoms, medium-chain fatty acids (MCFA) have 7-12 carbon atoms, and long-chain fatty acids (LCFA) have 13 or more carbon atoms. Unsaturated fatty acids have double bonds between some of the carbon atoms in their chain, while saturated fatty acids do not.

Free acids are typically classified according to their functional group. Some of the most common free acids include acetic acid (vinegar), citric acid (citrus fruits), and hydrochloric acid (stomach acid).

Fatty acids and free acids both have a sour taste and can be irritating to the skin. However, fatty acids are generally considered to be healthy, while free acids can be harmful if consumed in large amounts.