CoSO4·7H2O, known as cobalt(II) sulfate heptahydrate, is a chemical compound composed of cobalt, sulfur, and oxygen, along with seven water molecules. It appears as a pink crystalline solid and is commonly used in various applications, including as a drying agent and in the production of pigments. This compound is soluble in water and can be formed by dissolving cobalt(II) oxide or cobalt(II) carbonate in sulfuric acid. Cobalt(II) sulfate is also important in the field of chemistry and is utilized in the preparation of cobalt salts and in the manufacture of catalysts.