Hydrated copper sulfate, often represented as CuSO4·5H2O, is a blue crystalline solid that contains five water molecules for each copper sulfate unit. It is commonly used in laboratories and industries for various applications, including as a fungicide, herbicide, and in the production of pigments. When heated, hydrated copper sulfate loses its water content and turns into anhydrous copper sulfate, which is a white powder. This process is reversible; adding water back to the anhydrous form restores the blue color, demonstrating a physical change that is often used in educational demonstrations.