Nitrate is a strong oxidizing, corrosive acid. Nitric acid is soluble in water and its solution is colorless and transparent at normal temperature. The properties of the aqueous solution with different concentrations are different, the concentrated nitric acid in the market is a constant boiling mixture, the mass fraction is 69.2% (about 16mol/L), and the mass fraction is large enough (the concentration of the market is over 95%). Easy to see light decomposition of nitrate, should be in brown bottle in the shadows to avoid light preservation, can also be saved in the outer frosted plastic bottle (not recommended), with no reducing agent contact. Nitric acid is mainly produced by ammonia oxidation in industry, it is used to produce chemical fertilizer, explosive and nitrate. The chemical formula is HNO3, concentrated nitric acid and concentrated hydrochloric acid according to the volume ratio of 1:3 mixture can be made with corrosive aqua. Reagent nitric acid is mainly used in chemical experiments, analysis and preparation of nitrate reagent