CAS 7697-37-2: Nitric Acid (HNO3)

Identity

CAS Number7697-37-2
Molecular FormulaHNO3
IUPAC Namenitric acid
Molecular Weight63.01 g/mol
SMILES[O-][N+](=O)O
Synonymsaqua fortis, spirit of nitre, engraver's acid, HNO3

2D Structure

Physical Properties

Density1.512 g/mL at 25°C
Boiling Point83.0°C
Melting Point-42.0°C
Flash PointNone°C
Vapor Pressure6.4 kPa at 20°C
Refractive IndexnD = 1.397
Dielectric Constantε = 50.0

Safety & GHS Classification

GHS03GHS05GHS06

Storage: Store in acid-resistant containers away from organic materials and reducing agents. Strong oxidizer — never mix with organic solvents. Fuming nitric acid requires special handling. Use in fume hood with acid-resistant PPE.

Material Compatibility Matrix

Plastics

MaterialRating
PTFEExcellent
PVCGood
PEGood
PPFair
PEEKGood
PVDFGood

Rubbers

MaterialRating
VitonFair
NBRSevere Effect
EPDMPoor
SiliconePoor
FKMFair

Metals

MaterialRating
Stainless 316Poor
AluminumPoor
CopperPoor
BrassPoor

Applications

External References: PubChem

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