Pentahydrate refers to a chemical compound that contains five molecules of water (H₂O) for each molecule of the substance. This term is often used in the context of salts and minerals, where the water molecules are integrated into the crystal structure. The presence of water can affect the physical properties, such as solubility and stability, of the compound. Common examples of pentahydrates include copper(II) sulfate pentahydrate and magnesium sulfate pentahydrate. These compounds are often used in various applications, including agriculture, chemistry, and pharmaceuticals. Understanding pentahydrates is important for scientists and industries that rely on precise chemical formulations.