Nitric acid 68% Hno3 68% min; hno2 0.05% max. Chemical name:nitric acid, industrial Molecular formula :hno3 Molecular weight :63.01 Property: clear, light yellow liquid. Fumes in moist air. Characteristic choking odor. Very corrosive. Decompose to nitrogen dioxide under light or heat. Main use: can be used in medicine, dyestuff, equipment for taking photos. It is also one of the important materials of explosive industry.