Digold trioxide

CAS NO.：1303-58-8
Empirical Formula: Au2O3
Molecular Weight: 441.93
MDL number: MFCD00014173
EINECS: 215-122-1
SAFETY DATA SHEET (SDS)
Update Date: 2025-07-16 09:55:29

What is Digold trioxide?

Chemical properties

Brownish-black powder, decomposed by heat.Keep in dark bottle. Soluble in hydrochloric acid; insoluble in water.

The Uses of Digold trioxide

Gold plating

The Uses of Digold trioxide

It is used in aerospace and electrochemical applications such as fuel cells in which they exhibit ionic conductivity. It acts as strong reducing agent in redox reactions.

Purification Methods

The most probable impurities are SO4and Cl-ions. Dissolve it in strong boiling KOH solution (ca 5M) and precipitate (care) with excess of 3N H2SO4. Then shake and centrifuge, resuspend in H2O and repeat the washing several times until free from SO4 and Cl ions. This gives a wet oxide which is dried in air, but decomposes to free gold in sunlight. It is advisable to keep it wet as it decomposes on drying (analyse wet sample). Store it away from light in the presence of H2O vapour. It evolves O2 at 110o. It is insoluble in H2O but soluble in HCl and conc HNO3. [Roseveare & Buehrer J Am Chem Soc 49 1221 1927.]

Properties of Digold trioxide

Melting point:	150°C
solubility	insoluble in H2O; soluble in acid solutions
form	Powder
color	Brown
Water Solubility	Insoluble in water. Soluble in HCl, HNO<sub>3</sub> and in NaCN solution.
Merck	14,4524
CAS DataBase Reference	1303-58-8(CAS DataBase Reference)
EPA Substance Registry System	Gold oxide (Au2O3) (1303-58-8)

Safety information for Digold trioxide

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation
Precautionary Statement Codes	P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P321:Specific treatment (see … on this label). P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P332+P313:IF SKIN irritation occurs: Get medical advice/attention. P337+P313:IF eye irritation persists: Get medical advice/attention.