Barium hydroxide monohydrate

CAS Number
22326-55-2
EC Number
606-983-8

What is Barium hydroxide monohydrate?

Barium hydroxide monohydrate (CAS 22326-55-2) is a strong inorganic base in solid form, distinct from the anhydrous and octahydrate variants in handling characteristics and water content.

Where is Barium hydroxide monohydrate used?

  • Chemical manufacturing: pH regulator, alkaline catalyst and precipitating agent
  • Water treatment: precipitates sulfate and heavy metal ions, enabling effluent compliance in industrial discharge streams
  • Pharmaceutical synthesis: base catalyst where controlled alkalinity and low ionic contamination are critical
  • Mining and metallurgy: adjusts leach circuit pH and removes sulfate from process water, reducing scaling and corrosion in downstream equipment
  • In biotechnology and laboratory settings it supports CO₂ absorption and reagent preparation.

Commercial specifications

  • Technical grade is the standard commercial form; reagent and pharmaceutical grades are available for higher-purity applications.
  • Packaging ranges from multi-wall bags to bulk quantities depending on application scale.

Other Names (Synonyms)

Barium hydroxide (Ba(OH)2), monohydrate|Barium HYDROXIDE MONOHYDRETE

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What are the physical properties of Barium hydroxide monohydrate?

Melting Point 78 °C(lit.)
Density 3.743 g/mL at 25 °C(lit.)
Color White
Form Crystalline
Water Solubility Soluble in water.
Vapor Pressure 300 hPa ( 78 °C)

Which trade and regulatory codes apply to Barium hydroxide monohydrate?

UN Number 3262
ADR Class 8
Packing Group III
Storage Class 8B - Non-combustible corrosive hazardous materials
WGK (Germany) 1
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