Barium sulfate from a pharmacy
| IUPAC name
| Other names
|Molar mass||233.43 g/mol|
|Melting point||1,580 °C (2,880 °F; 1,850 K)|
|Boiling point||1,600 °C (2,910 °F; 1,870 K) (decomposes)|
| 0.0002448 g/100 mL (20 °C)|
0.000285 g/100 mL (30 °C)
|Solubility|| Soluble in concentrated sulfuric acid|
Insoluble in acetone, chloroform, ethanol, toluene
Std enthalpy of
|Safety data sheet||ScienceLab|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Barium sulfate or barium sulphate is an insoluble salt of barium, with a variety of applications. It has the chemical formula BaSO4.
Barium sulfate isn't terribly reactive, but there is a way of converting it to other barium salts. The trick is that barium carbonate is even less soluble than barium sulfate, and sulfate can be converted to carbonate by lengthy boiling in a solution of sodium carbonate. This should be done under reflux, to prevent the solution in the pot from drying.
Barium sulfate is a dense white solid, insoluble in water.
Barium sulfate can be purchased from many pharmacies.
Barium sulfate can be easily prepared by reacting any soluble barium salt with sulfuric acid or a sulfate.
- Make white pigment
- Green flame in some pyrotechnics
- Paper brightener
- Making barium carbonate
Although soluble salts of barium are toxic to humans, barium sulfate is nontoxic due to its insolubility. This allows it to be used safely in X-ray investigations.
Barium sulfate should be stored in closed bottles.
Due to its low toxicity, barium sulfate doesn't require special disposal.