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is the inorganic compound with the formula HNO3. It is a highly corrosive mineral acid.
The compound is colorless, but older samples tend to be yellow cast due to decomposition into oxides of nitrogen. Most commercially available nitric acid has a concentration of 68% in water. When the solution contains more than 86% HNO3, it is referred to as fuming nitric acid
. Depending on the amount of nitrogen dioxide present, fuming nitric acid is further characterized as red fuming nitric acid
at concentrations above 86%, or white fuming nitric acid
at concentrations above 95%.