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  • Product Name:   Chloroauric acid
  • Synonyms:   Hydrogen tetrachloroaurate(III) solution, Au 40-44 wt. %;auricacid;browngoldchloride;chlorauricacid;goldtetrachloride,acid
  • CAS No.:   16903-35-8
  • Molecular Formula:   AuCl4H
  • Molecular Weight :   339.79
  • Specification :   98%
  • Place of Origin:   China
  • Appearance :   
  • Document :   Download

Description of Chloroauric acid
Chloroauric acid Chemical Properties
Melting point  30°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
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
Hazard Codes  C,Xi
Risk Statements  36/37/38-43-34-36/38-23
Safety Statements  26-36/37/39-45-36/37
RIDADR  UN 3260 8/PG 3
WGK Germany  3
RTECS  CK6330000
F  3-8-10
TSCA  Yes
HazardClass  8
PackingGroup  III
Chloroauric acid Usage And Synthesis
Chloroauric acid Chloroalic acid is also known as "gold chloride", "gold chloride tetrahydrate". Chemical formula is HAuCl4 • 4H2O. Molecular weight is 411.85. It is a yellow needle crystal. It is toxic and corrosive. It is easily soluble in water, and soluble in ethanol and ether, and slightly soluble in chloroform. Anhydrous chloroauric acid can be crystallized from the ethanol solution. It will decompose under heat condition, and decompose into gold trichloride at 120 ° C. Exposure of it leads to black spots. In alkaline solution, it reacts with KI to precipitate brown gold. In the acidic solution, it generates "cinnamon purple in the case of tin dichloride. Its aqueous solution was purple after dealing with methyl orange, and it turns green after 1 to 3 drops of hydrochloric acid, and then it becomes lavender after gold salt solution. We get gold hydroxide precipitation after adding cold potassium hydroxide solution. It was reduced to gold powder with sulfur dioxide.
Preparation Dissolve the pure gold in aqua regia (or hydrochloric acid saturated by chlorine gas). After distillation and crystallization, we get the product.
Application Chlorine acid is mainly used for alkaloid determination, electroplating gold, photography, gold powder, porcelain coloring, red glass manufacturing, special ink and treatment of tuberculosis. It can also be used as analytical reagent, such as microanalysis of rubidium (Rb) and cesium (Cs). It is used for semiconductor, electronic connector and local gold-plated of integrated circuit lead frame, also for printing circuit boards.
Chemical Properties golden to yellowish brown crystals or powder
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.]
Chloroauric acid Preparation Products And Raw materials

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