Nitric acid
CAS 7697-37-2HNO363.013 g/mol
Nitric acid is a nitrogen oxoacid of formula HNO3 in which the nitrogen atom is bonded to a hydroxy group and by equivalent bonds to the remaining two oxygen atoms. It has a role as a reagent and a protic solvent. It is a conjugate acid of a nitrate.
IUPAC: nitric acid
PubChem
Physical & Chemical Properties
| Melting Point | -44 °F (NIOSH, 2024) |
| Boiling Point | 181 °F at 760 mmHg (NIOSH, 2024) |
| Density | 1.5 at 77 °F (NIOSH, 2024) - Denser than water; will sink |
| Solubility | Miscible (NIOSH, 2024) |
| Vapor Pressure | 48 mmHg (NIOSH, 2024) |
| Appearance | Nitric acid, other than red fuming appears as a pale yellow to reddish brown liquid with reddish brown vapors and a suffocating odor. Very toxic by inhalation. Corrosive to metals or tissue. Accelerates the burning of combustible material and may cause ignition of combustible materials upon contact. Prolonged exposure to low concentrations or short term exposure to high concentrations may result in adverse health effects. Density 12 lb / gal. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2808
Data: UN Comtrade
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