Characteristic

 

Barium chloride is the inorganic compound with the formula BaCl₂. It is one of the most common water-soluble salts of barium. Like most other barium salts, it is white, toxic, and imparts a yellow-green coloration to a flame. 

Chemical formula：BaCl₂

Molar mass：208.23 g/mol (anhydrous);244.26 g/mol (dihydrate)

Appearance：White solid

Density:3.856 g/cm3 (anhydrous);3.0979 g/cm3 (dihydrate)

Melting point:962 °C (1,764 °F; 1,235 K) (960 °C, dihydrate)

Boiling point:1,560 °C (2,840 °F; 1,830 K)

Solubility in water:31.2 g/100 mL (0 °C);35.8 g/100 mL (20 °C);59.4 g/100 mL (100 °C)

Solubility:soluble in methanol, insoluble in ethanol, ethyl acetate

Magnetic susceptibility (χ):-72.6·10⁻⁶ cm³/mol

Crystal structure:orthogonal (anhydrous);monoclinic (dihydrate)

 

Application

 

In industry, barium chloride is mainly used in the purification of brine solution in caustic chlorine plants and also in the manufacture of heat treatment salts, case hardening of steel, in the manufacture of pigments, and in the manufacture of other barium salts. BaCl₂ is also used in fireworks to give a bright green color. It is commonly used as a test for sulfate ion.