Gold hydroxide Property

Melting point:

decomposes at ~100℃ [LID94]

solubility 

insoluble in H2O; soluble in acid solutions

form 

Powder

color 

brown

Water Solubility 

Insoluble in water.

Sensitive 

Light Sensitive

Merck 

14,4523

Solubility Product Constant (Ksp)

pKsp: 45.26

Stability:

Stability May decompose upon exposure to light. Incompatible with strong oxidizing agents.

CAS DataBase Reference

1303-52-2(CAS DataBase Reference)

EPA Substance Registry System

Gold hydroxide (Au(OH)3) (1303-52-2)

Safety

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-37/39

WGK Germany 

3

TSCA 

Yes

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P271Use only outdoors or in a well-ventilated area.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Gold hydroxide Chemical Properties,Usage,Production

Chemical Properties

solid

Physical properties

Brown powder; decomposes at 100°C; insoluble in water; soluble in acid.

Uses

Synthesis of gold hydroxide complexes with N-heterocyclic carbene has been reported. A variety of perfluoroaryls, N-heterocyclic and alkynyl compounds may be synthesized by reacting gold(III) hydroxide with C–H and N–H compounds and arylboronic acids. Potassium aurate may be prepared by heating auric hydroxide with conc. KOH. 3

Uses

In gold-plating solutions; for decorating porcelains.

Production Methods

Gold(III) hydroxide is precipitated by mixing aqueous solutions of potassium auric chloride and sodium carbonate:2KAuCl4 + 3Na2CO3 + 3H2O → 2Au(OH)3 + 6NaCl + 2KCl + 3CO2
The product usually contains about three molecules of water of crystallization. It may alternatively be prepared by adding caustic soda solution to sodium auric cyanide: NaAu(CN)4 + 3NaOH → Au(OH)3 + 4NaCN.