Nitric acid (HNO₃), as a strong oxidizing agent, is one of the most important inorganic acids and it can be manufactured by the catalytic oxidation of ammonia.
As a key component of fertilizers, it is one of the most widely produced chemical raw materials in the world. Nitric acid is a colorless liquid with an extremely pungent odor and corrosive properties. When stored for a long time and exposed to temperature, it turns yellow due to spontaneous decomposition into nitrogen oxides and water. It reacts readily with numerous substances and produces heat when dissolved in water. A significant proportion of reactions involving it are even explosive.