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Nitric acid is a strong oxidizing, corrosive acid. Nitric acid soluble in water, its solution is colorless and transparent at room temperature. The nature of the different solution concentrations are different, commercially available constant boiling mixture of concentrated nitric acid, the mass fraction of 69.2% (about 16mol / L), the mass fraction is large enough (commercially available concentration of more than 95%), known as fuming nitric acid. Nitrate is easy to see light decomposition, should be stored in a brown bottle in the shadows dark, forbidden contact with a reducing agent. Nitric acid in the industrial production mainly in the oxidation of ammonia, for the manufacture of fertilizers, explosives, nitrate and the like; in organic chemistry, a mixture of concentrated nitric acid and concentrated sulfuric acid nitrating agent is important. Chemical formula HNO3, the volume of nitric acid and hydrochloric acid in 1: 3 mix can be made of highly corrosive aqua regia. Nitric acid anhydride is dinitrogen pentoxide (N2O5). Pure nitric acid is a colorless, transparent liquid, concentrated nitric acid as a pale yellow liquid (dissolved nitrogen dioxide), under normal circumstances is a colorless transparent liquid. A suffocating smell. Concentrated nitric acid content is about 68%, volatile, to produce white mist in the air, the vapor of nitric acid is combined with water vapor to form nitric acid droplets. Nitrogen dioxide and become exposed to light brown. Strongly acidic. Make wool and animal tissues become bright yellow. With ethanol, turpentine, carbon and other organic matter Meng strong reaction. Miscible with water. Capable of forming an azeotropic mixture with water. Relative density (d204) 1.41, m.p. -42 ℃ (anhydrous) [9], boiling point 120.5 ℃ (68%). For dilute nitric acid, dilute concentration generally we believe that the boundaries between the 6mol / L, a commercially available ordinary reagent grade nitric acid concentration of about about 68%, while the concentration of industrial grade was 98% concentrated nitric acid, fuming nitric acid concentration is generally about 98 %.