Cobalt(II) chloride is a chemical compound with the formula CoCl2. It consists of cobalt in a +2 oxidation state and two chloride ions. This compound is often found as a blue crystalline solid, which can change color to pink when hydrated, forming CoCl2·6H2O. Cobalt(II) chloride is used in various applications, including as a drying agent in chemical reactions and in humidity indicators due to its color change. It is also utilized in the production of cobalt salts and as a catalyst in organic synthesis.