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Bismuth(III) Hydroxide
Other Names: Bismuth trihydroxide

CAS Number: 1361-43-0
Sum Formula: Bi(OH)₃
Molar Mass: 260.00 g/mol
Appearance: White to slightly beige amorphous or microcrystalline solid

Bismuth(III) hydroxide is an inorganic compound consisting of trivalent bismuth cations and hydroxide anions. It is typically obtained by precipitation from aqueous bismuth salt solutions upon reaction with alkali hydroxides. It is sparingly soluble and exhibits amphoteric behavior.

Chemical and Physical Properties
Density: Approx. 4.2 g/cm³ (estimated)
Melting Point: Decomposes before melting
Boiling Point: Not applicable (decomposes)
Solubility in Water: Practically insoluble
Solubility in Other Solvents: Insoluble in organic solvents; dissolves in dilute acids and alkalis
Odor: Odorless

Applications
Inorganic Synthesis: Used as a precursor to bismuth oxides and other bismuth-containing compounds.
Catalysis: Investigated as a component of heterogeneous catalysts.
Material Science: Raw material in the production of functional bismuth ceramics.
Laboratory Chemistry: Precipitation agent in selective metal ion separation.

Safety
Signal Word: Warning

Hazard Statements:
H332: Harmful if inhaled.
H335: May cause respiratory irritation.
H412: Harmful to aquatic life with long lasting effects.

Precautionary Statements:
P261: Avoid breathing dust.
P271: Use only outdoors or in a well-ventilated area.
P273: Avoid release to the environment.
P280: Wear protective gloves, protective clothing, and eye protection.
P304+P340: IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P312: Call a POISON CENTER or doctor if you feel unwell.

Handling and Storage
Storage Conditions: Store in a tightly closed container in a cool, dry, and well-ventilated area. Avoid exposure to acids, moisture, and reducing agents.
Handling Precautions: Avoid generating dust. Use proper personal protective equipment. Handle under dry conditions and according to good laboratory practices.