Barium sulfide is the name of the compound represented by the molecular formula BaS. It exists as a solid at room temperature and is soluble in water.
Barium sulfide is extremely poisonous; it forms the toxic gas hydrogen sulfide when exposed to water. Exposure to this gas can be fatal.
Barium sulfide has a molar mass of 169.39 grams per mole and a melting point of 1200 degrees Celsius. Barium sulfide is synthesized using a carbothermic reaction, which reduces barium sulfate to barium sulfide, releasing carbon dioxide gas in the process. This inorganic compound is used as a precursor for synthesizing several barium-containing products. These products include the pigment lithopone and many others.