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Sodium nitrite (NaNO₂) is an inorganic salt formed by the ionization of nitrite ions and sodium. Sodium nitrite is easily delirious and soluble in water and liquid ammonia. Its aqueous solution is alkaline, with a pH of about 9. It is slightly soluble in organic solvents such as ethanol, methanol and ethyl ether. A strong oxidant and reducibility, will gradually oxidize in the air, the surface will become sodium nitrate, can also be oxidized by oxidants; Brown nitrogen dioxide gas is released by decomposition with weak acid. Contact with organic matter and reducing agent can cause explosion or combustion, and emit toxic and irritating nitrous oxide gas; In case of strong oxidant can also be oxidized, especially ammonium salt, such as ammonium nitrate, ammonium persulfate and so on at room temperature, that is, can interact to produce high heat, causing combustible combustion. Sodium nitrite reacts with oxygen to form sodium nitrate when exposed to air. If it is heated to above 320℃, it will decompose and produce oxygen, nitrogen oxide and sodium oxide. Combustible and explode easily in contact with organic matter.

To use: 
Chromatographic analysis. Drip analysis was used to determine mercury, potassium, and chlorate.
Diazo reagent. Nitrous reagent. Soil analysis. Serum bilirubin was measured in liver function test.
Bleach for silk and linen, metal heat treating agent; Steel corrosion inhibitor; Antidotes for cyanide poisoning, reagents for laboratory analysis, used as chromatin, microbicide, preservative in meat products processing. It has applications in bleaching, electroplating and metal treatment and is called industrial salt.

Storage
Sodium nitrite should be placed in low temperature, dry, ventilated warehouse. Close doors and Windows prevent direct sunlight. Can be stored with other nitrate other than ammonium nitrate, but with organic matter, inflammables, reductants isolated storage, and isolation of the source of fire.