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Sodium azide Chemical Structure

What is Sodium azide?

Sodium azide is an inorganic compound and is the sodium salt of hydrazoic acid. It is an ionic solid, existing in two crystalline forms – rhombohedral and hexagonal. It has a high solubility in water. It has a high level of acute toxicity.

Macsen Laboratories is the supplier of high-quality Sodium azide.
Name of Product Sodium azide
IUPAC Name sodium;azide
Synonyms Sodium trinitride; Smite; Azium; Hydrazoic acid sodium salt; Natriumazid; Azoture de sodium; azidosodium; Sodium, azoture de
CAS No 26628-22-8
Molecular Formula NaN3
Molar Mass 65.010 g/mol
Pubchem CID 33557
Pubchem SID 480474277

Chemical Properties

SR. No Criteria Limit/Specification
1 Appearance (Form) Solid Powder, Crystals
2 Appearance (Color) Colorless to White
3 Odor Odorless
4 Density 1.846 g/cm3
5 Melting point 275 °C
6 Solubility Highly soluble in ammonia and water
Slightly soluble in ethanol and benzene
Insoluble in ether, acetone, hexane, chloroform
7 Solubility (In Water) 38.9 g/100 mL (0 °C)
40.8 g/100 mL (20 °C)
55.3 g/100 mL (100 °C)
8 Acidity (pKa) 4.8
9 Decomposition When heated to decomposition it emits very toxic fumes of nitrogen oxides and disodium oxide


  • Sodium azide is used as a propellant in automobile air bags as a source to generate gas for airbag inflation.
  • It is utilized in organic and inorganic synthesis to introduce the azide functional group, for example, as a reagent in the synthesis of blue fluorescent copolymers, metal phosphonates, and arenes. It also works as a precursor to other inorganic azide compounds, such as lead azide and silver azide.
  • It is an antimicrobial preservative for biochemical solutions as well as a helpful probing reagent in biochemistry.
  • Sodium azide is a bacteriostatic preservative that is extensively used to preserve biological specimens. It shows bacteriostatic properties by acting as a a nitridizing agent and by inhibiting oxidative phosphorylation in some species of bacteria.
  • In agriculture, it is used for pest control of soil-borne pathogens such as Meloidogyne incognita or Helicotylenchus dihystera and as a mutagen for crop selection of plants such as rice, barley or oats.

Toxicity (Side effects)

Sodium azide is fatally toxic, and even minute quantities can induce symptoms. It results in extrapyramidal symptoms in addition to necrosis of the cerebral cortex, cerebellum, and basal ganglia. Hypotension, blindness, and hepatic necrosis may also be the symptoms of toxicity.

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