Sulfuric acid（H2SO4）

Sulfuric acid is an inorganic compound, the chemical formula H2SO4, the most important oxygen-containing acid of sulfur. Pure concentrated sulfuric acid is a colorless oily transparent liquid, Crystallization at 10.36 ℃, It is usually used in various concentrations of aqueous solutions, such as 50% sulfuric acid. The relative density of concentrated sulfuric acid is 1.84.