Sodium hydride, with the chemical formula NaH, is an inorganic salt. In organic synthesis, Sodium hydride is mainly used as a strong base. Sodium hydride is a typical representative of salt hydrides, meaning it is composed of Na+ and H−, which is different from molecular hydrides such as borane, methane, ammonia and water. Sodium hydride is insoluble in organic solvents but soluble in molten metallic Sodium. Therefore, almost all reactions related to Sodium hydride occur on solid surfaces.