CoCl2·6H2O, also known as cobalt(II) chloride hexahydrate, is a chemical compound composed of cobalt, chlorine, and water. It appears as blue crystals when hydrated and can change to a pink color when dehydrated. This compound is often used in laboratories and industries for various applications, including as a drying agent and in the production of cobalt salts. The formula indicates that each molecule of cobalt(II) chloride is associated with six water molecules. Cobalt is a transition metal, and its compounds are important in many chemical processes. Hexahydrate refers to the presence of six water molecules, which are integral to the compound's structure and properties.