Co(NO3)2·6H2O, known as cobalt(II) nitrate hexahydrate, is a chemical compound composed of cobalt, nitrogen, and oxygen, along with water molecules. It appears as a blue crystalline solid and is commonly used in laboratories and industrial applications. The "6H2O" indicates that each formula unit contains six water molecules, which are essential for its stability and solubility. This compound is often utilized in the production of cobalt salts and as a catalyst in various chemical reactions. Additionally, it serves as a source of cobalt ions in biochemical studies and is important in the synthesis of cobalt compounds for pigments and battery materials.