Copper(II) sulfate dihydrate, often represented as CuSO4·2H2O, is a blue crystalline solid commonly used in various applications. It consists of one copper ion, one sulfate ion, and two water molecules. This compound is known for its vibrant blue color and is often found in laboratories and educational settings. In agriculture, copper(II) sulfate dihydrate serves as a fungicide and herbicide, helping to control plant diseases. Additionally, it is used in the production of pigments, in electroplating, and as a chemical reagent in various experiments. Its properties make it a versatile compound in both industrial and educational contexts.