Nitric acid , its cas register number is 7697-37-2. It also can be called Acide nitrique ; Acido nitrico ; Acidum nitricum ;

 Aqua fortis ; Azotic acid ; Azotowy kwas ; Engraver's acid ; Hydrogen nitrate ; Kyselina dusicne ; Nital ; Nitric acid ; Nitrous fumes ; Nitryl hydroxide ; Red fuming nitric acid ; Salpetersaeure ; Salpetersaure ; Salpeterzuuroplossingen ; UNII-411VRN1TV4 .

Nitric acid (CAS NO.7697-37-2) is a colorless, highly corrosive liquid and a very powerful oxidizing agent that in the highly pure state is not entirely stable and must be prepared from its azeotrope by distillation with concentrated sulfuric acid. Nitric acid gradually yellows because of decomposition to nitrogen dioxide. Solutions containing more than 80% nitric acid are called fuming nitric acids.