Nitric acid molecular formula HNO3, is a kind of strong oxidizing, corrosive inorganic acid, anhydride as dinitrogen pentoxide. Nitric acid and hydrochloric acid than the small ( PKa=*1.3 ), soluble in water, completely ionized in water, dilute solution at room temperature the colorless transparent, concentrated solution was brown. Nitric acid is not stable, easy to see light decomposition, should be in brown bottle in the shadows to avoid light preservation, is strictly prohibited and reducing agent contact. Nitric acid in industry mainly ammonia oxidation production, used in the manufacture of explosives, chemical fertilizer, nitrate, in organic chemistry, the mixture of concentrated nitric acid and concentrated sulfuric acid is important nitration reagents.

Application
A very wide application in the analysis and research work. The dissolution of metal. Medium inorganic acid. Oxidizing agent. Preparation of nitro compounds in organic synthesis. Preparation of inorganic synthesis of nitrate, dye, fertilizer and manufacture of pharmaceutical intermediates, mainly used in the manufacture of ammonium nitrate, calcium ammonium nitrate, nitrate and phosphate fertilizer, potassium nitrate phosphate compound fertilizer defense industry for the manufacture of explosives three nitro toluene, nitro, picric acid etc.