Oxalic acid Oxalic acid Oxalic acid is an organic compound with the formula CHO. It is a colorless crystalline solid that forms a colorless solution in water. Its condensed formula is HOOCCOOH, reflecting its classification as the simplest dicarboxylic acid. Its acid strength is much greater than that of acetic acid. Oxalic acid is a reducing agent and its conjugate base, known as oxalate (), is a chelating agent for metal cations. Typically, oxalic acid occurs as the dihydrate with the formula CHO·2HO. It occurs naturally in many foods, but excessive ingestion of oxalic acid or prolonged skin contact can be dangerous.
Nonanoic acid Nonanoic acid Nonanoic acid, also called pelargonic acid, is an organic compound with structural formula CH(CH)COH. It is a nine-carbon fatty acid. Nonanoic acid is a colorless oily liquid with an unpleasant, rancid odor. It is nearly insoluble in water, but very soluble in organic solvents. The esters and salts of nonanoic acid are called nonanoates. Its refractive index is 1.4322. Its critical point is at 712 K (439 °C) and 2.35 MPa. Nonanoic acid occurs naturally as esters in the oil of pelargonium. Together with azelaic acid, it is produced industrially by ozonolysis of oleic acid. Synthetic esters of