Sodium sulfate is an inorganic compound with the chemical formula Na2SO4, commonly known as Glauber's salt in its decahydrate form. It is a white, odorless crystalline solid that occurs naturally as the mineral thenardite and is widely used in various industrial applications, including as a drying agent in organic synthesis, in the manufacture of detergents, glass, and paper, and as a laxative in pharmaceuticals. In food processing, it serves as a firming agent and is recognized as safe by regulatory bodies. Chemically, it is an ionic salt composed of sodium cations and sulfate anions, exhibiting high solubility in water due to its ionic nature, which allows it to dissociate into ions and interact with water molecules. This property makes it useful in water treatment and as an electrolyte. Sodium sulfate is stable under normal conditions but can form hydrates, such as the decahydrate (Na2SO4·10H2O), which is efflorescent and loses water when exposed to dry air. Its role in chemistry includes applications in precipitation reactions and as a source of sulfate ions. Environmentally, it is considered a low-impact compound, though excessive use can contribute to sulfate pollution in water systems. Overall, sodium sulfate is valued for its low cost, abundance, and versatility in both industrial and everyday applications, with ongoing research into its use in sustainable technologies like solar energy storage due to its phase change properties.