Barium oxide

Barium oxide

Names
IUPAC name Barium oxide
Other names Baria Barium protoxide Barium monoxide Calcined baryta
Properties
Chemical formula	BaO
Molar mass	153.326 g/mol
Appearance	White solid
Odor	Odorless
Density	5.72 g/cm3
Melting point	1,923 °C (3,493 °F; 2,196 K)
Boiling point	2,000 °C (3,630 °F; 2,270 K)
Solubility in water	Reacts
Solubility	Reacts with alcohols, acids, bromine, phenol Insoluble in liq. ammonia, organic solvents
Vapor pressure	~0 mmHg
Thermochemistry
Std molar entropy (So298)	70 J·mol−1·K−1
Std enthalpy of formation (ΔfHo298)	−582 kJ/mol
Hazards
Safety data sheet	Sigma-Aldrich
Flash point	Non-flammable
Lethal dose or concentration (LD, LC):
LD50 (Median dose)	146 mg/kg (rat, oral)
Related compounds
Related compounds	Strontium oxide Calcium oxide Magnesium oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Barium oxide is a white hygroscopic compound with the chemical formula BaO.

Properties

Chemical

Barium oxide reacts with water to give barium hydroxide.

Reaction with acids yields barium salts.

Physical

Barium oxide is a white solid, insoluble in solvents.

Availability

Barium oxide is sold by chemical suppliers. Can also be bought online.

Preparation

Barium oxide can be prepared by burning barium metal in an oxygen atmosphere.

Reducing barium carbonate with carbon will also give barium oxide.

Projects

• Make barium salts
• Make barium peroxide
• Ethoxylation catalyst
• Make crown glass

Handling

Safety

Barium oxide is caustic and very toxic.

Storage

In closed plastic bottles, away from moisture and acids.

Disposal

Should be converted to barium sulfate, which can be dumped in trash.

References

Relevant Sciencemadness threads

• Barium Oxide from Barium Carbonate