Sodium Nitrite/Nitrate

Sodium nitrite is an inorganic compound with the chemical formula NaNO2. It is a white to slightly yellowish crystalline powder that is very soluble in water and is hygroscopic. From an industrial perspective, it is the most important nitrite salt. It is a precursor to a variety of organic compounds, such as pharmaceuticals, dyes, and pesticides, but it is probably best known as a food additive used in processed meats and (in some countries) in fish products.

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Application

It is used as a colour fixative and preservative in meats and fish. It is also used in: adhesives, binding agents, anti-freezing agents, cleaning/washing agents, disinfectants, colouring agents, construction materials additives, corrosive inhibitors, cutting fluids, fillers, food/foodstuff additives, heat transferring agents, intermediates, laboratory chemicals, lubricants and additives, non agricultural pesticides, oxidizing agents, pesticides, pharmaceuticals, process regulators, reducing agents, stabilizers, surface-active agents.

Molar mass

68.9953 g/mol
Chemical formula

NaNO2
Appearance

white or slightly yellowish solid
Density

2.168 g/cm3
Melting point

271 °C (520 °F; 544 K) (decomposes at 320 °C)
Solubility in water

71.4 g/100 mL (0 °C)
84.8 g/100 mL (25 °C)
160 g/100 mL (100 °C)
Solubility

soluble in methanol (4.4 g/100 mL)
ethanol
slightly soluble in diethyl ether (0.3 g/100 mL)
very soluble in ammonia
Acidity (pKa)

~9
Magnetic susceptibility (χ)

−14.5·10−6 cm3/mol
Refractive index (nD)

1.65

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