Chemical Properties
Its chemical structure is orthorhombic or hexagonal (anhydrous) and monoclinic (decahydrate). Sodium sulfate is chemically very stable, being unreactive toward most elements at normal temperatures. At high temperatures, it can be reduced to sodium sulfide (4). It is a neutral salt, which forms watery solutions with pH of 7. This is the neutrality of the acid sulfuric acid and the strong base sodium hydroxide. Sodium sulfate reacts with an equivalent amount of sulfuric acid to give an equilibrium concentration of the acid salt sodium bisulfate.
Physical Properties
It has a white crystalline sold appearance with an odorless odor. Its molar mass is 142.04 g/ml (anhydrous) and 322.20 g.ml (decahydrate). Its density is 2.664 g/cm3 (anhydrous) and 1.464 g/cm3 (decahydrate).