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Nitric acid (HNO3), also known as aqua fortis and spirit of niter, is a highly corrosive strong mineral acid. The pure compound is colorless. Most commercially available nitric acid has a concentration of 68%. Nitric acid is also commonly used as a strong oxidizing agent.

Nitric Acid
Image of Nitric Acid in a bottle


Sr. No Determination Specification
1 Total acidity (As HNO3)% by mass 68 % min
2 Appearance Clear Colorless Liquid
3 Nitrogen oxides(as HNO2) % by mass 0.006 Max
4 Chlorides(as Cl )%by mass max 0.002 Max
5 Sulphate (as H2SO4) % by mass 0.005 Max
6 Residue Ignition 0.05 Max