What is Nitric acid?
The principal technique of manufacture nitric acid is the catalytic oxidation of ammonia. Within the technique developed by the German chemist Wilhelm Ostwald in 1901, ammonia gas is successively oxidized to nitric oxide and nitrogen dioxide by air or oxygen within the presence of a platinum gauze catalyst. The nitrogen dioxide is absorbed in water to kind nitric acid. The ensuing acid-in-water answer (about 50–70 % by weight acid) might be dehydrated by distillation with sulfuric acid.