Cobalt(II) sulfate, represented by the chemical formula CoSO4, is an inorganic compound composed of cobalt, sulfur, and oxygen. It typically appears as a blue or pink crystalline solid, depending on its hydration state. The most common form is cobalt(II) sulfate heptahydrate, CoSO4·7H2O, which contains seven water molecules and is often used in various industrial applications. This compound is primarily utilized in the production of pigments, fertilizers, and as a drying agent in paints and inks. Additionally, CoSO4 plays a role in the preparation of other cobalt compounds and is important in the field of catalysis and battery technology.