Barium Hydroxide

Last updated: October 29, 2017

What Does Barium Hydroxide Mean?

Barium hydroxide is a chemical compound prepared from barium oxide when it is mixed with water. Barium hydroxide is used in corrosion inhibitors. The equation for the formation of barium hydroxide is:

BaO + 9H2O = Ba(OH)2.8H2O

Barium hydroxide may also be known as baryta.


Corrosionpedia Explains Barium Hydroxide

For industrial usage, barium hydroxide is available in the form of monohydrate and octahydrade. Where the temperature is more than 500°C (932°F), barium hydroxide decomposes to barium oxide. When it comes in contact with carbon dioxide, it produces barium carbonate, which is aqueous in solution, highly alkaline and will undergo a neutralization reaction when in contact with acids. After a neutralization reaction with an acid, it forms barium sulfate and barium phosphate and thus is used to dehydrate and remove sulfate from various products.

Some physical properties of barium hydroxide:

  • Stability – Generally stable compound, but reacts when in contact with carbon dioxide, moisture or acids
  • Appearance – White transparent crystals
  • Specific gravity – 2.18
  • Melting point – 408°C (766°F)
  • Boiling point – 780°C (1,436°F)
  • pH value – approximately 2
  • Density – 2.18 g/cm3



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