Oxalic acid - Wikipedia- oxalic để giặt ,Oxalic acid is an organic compound with the formula C 2 H 2 O 4.It is a white 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 (COxalic acid - WikipediaOxalic acid is an organic compound with the formula C 2 H 2 O 4.It is a white 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 (C