Nomenclature
CAS number: 1304-28-5
Barium monoxide; barium protoxide; calcined baryta.
BaO; mol wt 153.33.
Ba 89.56%, O 10.43%.
Description and references
Prepn: Ehrlich in Handbook of Preparative Inorganic Chemistry vol.
1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963)
p 933.
Properties
White to yellowish-white powder or lumps. Very
alkaline; absorbs moisture and CO2 on exposure to air.
Poisonous. On contact with water
it forms Ba(OH)2 with evolution of much heat. At 450°
combines with oxygen to form BaO2, which is reduced to
BaO above 600°. d 5.7. mp ≈1920°. Sol
in water, dil acids. Slowly, but considerably sol in methanol, ethanol
forming barium alcoholate. Keep tightly closed.Use
Porous grades are marketed especially for drying
gases and solvents (particularly alcohols, aldehydes and petroleum
solvents). Swells, but does not become sticky upon absorption of
moisture. Used in manuf of lubricating oil detergents. Also used
for making barium methoxide.