Chloroauric acid

Synonym(s):Auric chloride;Gold trichloride

CAS NO.：16903-35-8
Empirical Formula: AuCl4H
Molecular Weight: 339.79
MDL number: MFCD00011322
EINECS: 240-948-4
SAFETY DATA SHEET (SDS)
Update Date: 2024-10-30 18:52:02

What is Chloroauric acid?

Chemical properties

golden to yellowish brown crystals or powder

The Uses of Chloroauric acid

The HCl plus the HNO2 (hydrochloric and nitric acids) are combined to produce agua regia acid, which is the only acid that can dissolve gold.

The Uses of Chloroauric acid

Hydrogen tetrachloroaurate(III) acts as a precursor used in the purification of gold by electrolysis. It is also used for the recovery, concentration, purification and analytical determination of gold. It acts as a key starting material for the preparation of gold compounds. It plays an important role as a catalyst in the preparation of 2-arylbenzoxazoles.

Purification Methods

It is obtained as a dark red crystalline mass by dissolving Au in aqua regia and evaporating. When sublimed at 180o, the crystals are ruby red. The anhydrous salt is hygroscopic, soluble in H2O but sparingly soluble in EtOH and Et2O. Aurochloric acid is formed when AuCl3 is dissolved in HCl. [Diemer J Am Chem Soc 35 553 1913, Glemser & Sauer Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p1 056 1965.]

Properties of Chloroauric acid

Melting point:	30°C
Boiling point:	100 °C
Density	3.9 g/mL at 25 °C
storage temp.	2-8°C
solubility	H₂O: soluble
form	Liquid
color	yellow
Water Solubility	Miscible with water, alcohol, ester, ether and ketone.
Sensitive	Light Sensitive
Merck	13,4537
Exposure limits	ACGIH: Ceiling 2 ppm OSHA: Ceiling 5 ppm(7 mg/m3) NIOSH: IDLH 50 ppm; Ceiling 5 ppm(7 mg/m3)
Stability:	Stable. Hygroscopic. Light sensitive. Incompatible with strong bases, sulfides, cyanides, carbonates.
CAS DataBase Reference	16903-35-8(CAS DataBase Reference)
EPA Substance Registry System	Aurate(1-), tetrachloro-, hydrogen, (SP-4-1)- (16903-35-8)

Safety information for Chloroauric acid

Signal word	Danger
Pictogram(s)	Corrosion Corrosives GHS05 Exclamation Mark Irritant GHS07 Health Hazard GHS08 Environment GHS09
GHS Hazard Statements	H290:Corrosive to Metals H302:Acute toxicity,oral H314:Skin corrosion/irritation H373:Specific target organ toxicity, repeated exposure H411:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P314:Get medical advice/attention if you feel unwell. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.