Sodium sulfate hydrate, represented as Na2SO4·H2O, is a chemical compound consisting of sodium sulfate and one molecule of water. It appears as a white crystalline solid and is commonly used in various industrial applications, including glass manufacturing and as a drying agent in organic synthesis. This compound is also known as Glauber's salt when it contains ten water molecules, forming Na2SO4·10H2O. Sodium sulfate hydrate is soluble in water, and its properties can change with temperature, making it useful in thermal storage systems and other applications where heat management is essential.