HNO3 nitric acid - one of the major industrial chemical products, colourless, transparent liquid with a pungent, unpleasant smell. When heating, or under the influence of light gets a brown shade owing to partial decomposition according to the scheme:
4HNO3 → 4NO2 + 2H2O + O2
Release of dioxide of NO2 nitrogen also gives to solution coloring. Nitric acid mixes up with water in any ratios, restrictedly a rastvorima in ethyl oxide. Is strong monobasic acid, in water solutions it is totally dissociated on ions of H+ and NO3-. With water forms azeotropny mix (68.4% of HNO3 on weight, Tkip 120.7 °C, d420 1.41). Are known also mono - and trigidrat nitric acid.
As well as the majority of acids, nitric acid reacts with the bases, the main oxides and forces out weak acids from their salts. Salts of nitric acid are called nitrates.