Tham khảo tài liệu 'materials handbook 15th ed - g. brady_ h. clauser_ j. vaccari (mcgraw-hill_ 2002) episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 640 NITRIC ACID water but soluble in acids and in solutions of ammonium salts. Nickel carbonyl Ni CO 4 used for nickel plating by gas decomposition is a yellow volatile liquid. It is volatilized in a closed vessel with hydrogen as the carrier and the nickel is deposited at about 350 F 177 C . It will adhere to glass and wood as well as to metals. The material is a strong reducing agent and is explosive when mixed with oxygen. Nickel nitrate NiNO3 2 6H2O used in electric batteries comes in thin flat flakes. NITRIC ACID. Also called aqua fortis and azotic acid. A colorless to reddish fuming liquid of composition HNO3 having a wide variety of uses for pickling metals in etching and in the manufacture of nitrocellulose plastics dyestuffs and explosives. It has a specific gravity of 95 acid and a boiling point of 187 F 86 C and is soluble in water. Its fumes have a suffocating action and it is highly corrosive and caustic. Fuming nitric acid is any water solution containing more than 86 acid and having a specific gravity above . Nitric acid is made by the action of sulfuric acid on sodium nitrate or purified Chilean saltpeter and condensation of the fumes. It is also made from ammonia by catalytic oxidation or from the nitric oxide produced from air. The acid is sold in various grades depending on the amount of water. The strengths of the commercial grades are 38 40 and 42 Bé containing acid. . or reagent grade is 43 Bé with acid very low in iron arsenic or other impurities. It is usually shipped in glass carboys. Anhydrous nitric acid is a yellow fuming liquid containing the unstable anhydride nitrogen pentoxide N2O5 It is violently reactive and is a powerful nitriding agent. The dark-red fuming liquid known as nitrogen tetroxide N2O4 is really a concentrated water solution of nitric acid as this oxide is an unstable polymer of NO2. It is used as an oxidizer for rocket fuels as it contains 70 oxygen. Mixed acid or nitrating acid is a mixture of
