Sodium nitrite is an inorganic compound that has the chemical formula NaNO2. Sodium Nitrite is a yellowish-white crystalline powder in appearance and soluble in water and aqueous solution. Sodium nitrite is a non-combustible compound itself, but its hygroscopic nature assists other combustible materials burning. It is an essential salt from an industrial perspective. The reduction of nitrate salts when exposed to heat, light, ionizing radiation, metals, electrolytic reduction, and oxidation of lower nitrogen oxides in alkaline solution in the presence of a catalyst.