草酸 Oxalic acid
（重定向自Ethanedioic acid）
![](/Images/godic/202501/11/Oxalic_acid5244.png")
![](/Images/godic/202501/11/Oxalic_acid_dihyrate5244.JPG")
草酸（英文：Oxalic acid），也称乙二酸，是一种强有机酸，化学式为H2C2O4。常见的草酸通常含有两分子的结晶水（H2C2O4·2H2O）。草酸在菠菜和植物大黄中广泛存在。
Ethanedioic acid
中文百科
英语百科
Oxalic acid 草酸
（重定向自Ethanedioic acid）
![Structural formula of oxalic acid](/Images/godic/202501/11/Oxalsäure3.svg5244.png")
![Space-filling model of oxalic acid](/Images/godic/202501/11/Oxalic-acid-3D-vdW5244.png")
![Honeybee coated with oxalic acid crystals](/Images/godic/202501/11/Beecrystals5245.PNG")
Oxalic acid is an organic compound with the formula C2H2O4. 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 (C
2O2−
4), is a chelating agent for metal cations. Typically, oxalic acid occurs as the dihydrate with the formula C2H2O4·2H2O. Excessive ingestion of oxalic acid or prolonged skin contact can be dangerous.
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