(chemistry) The sodium salt of sulfurous acid, Na₂SO₃, used as a food preservative, in photography and in many industrial applications.

(inorganic chemistry) The mono sodium salt of sulfurous acid, NaHSO₃, used as a food preservative and as a reagent in organic synthesis.

(chemistry) The sodium salt of benzoic acid.

(chemistry) The sodium salt of formic acid; used in detergents, as a food preservative and in many industrial applications.

(chemistry) The sodium salt of nitrous acid, NaNO₂; used as a food preservative and in many industrial applications.

(inorganic chemistry) the sodium salt of nitric acid, NaNO₃; used as a food preservative, and as an oxidizing agent in explosives such as sodatol.

borax

(chemistry) The sodium salt of erythorbic acid.

(mineralogy) A water-soluble mineral NaAl(SO₄)₂·12(H₂O); a form of alum in which potassium is replaced by sodium.

A sodium vapor lamp.