| Identification | More | [Name]
Chloroauric acid | [CAS]
16903-35-8 | [Synonyms]
CHLORAUIC ACID
CHLOROAURIC ACID
CHLOROAURIC ACID BROWN
CHLOROAURIC ACID YELLOW
GOLD ATOMIC SPECTROSCOPY STANDARD
GOLD CHLORIDE
GOLD CHLORIDE (ACID YELLOW)
GOLD CHLORIDE, BROWN
GOLD TRICHLORIDE ACID BROWN
GOLD TRICHLORIDE ACID YELLOW
HYDROGEN TETRACHLOROAURATE (III)
TETRACHLOROAURIC ACID
auricacid
browngoldchloride
chlorauricacid
goldtetrachloride,acid
goldtrichloridehydrochloride
hydrogen,(sp-4-1)-aurate(1-tetrachloro-
hydrogentetrachloroaurate(1-)
tetrachloro-,hydrogen,(SP-4-1)-Aurate(1-) | [EINECS(EC#)]
240-948-4 | [Molecular Formula]
AuCl4H | [MDL Number]
MFCD00011322 | [Molecular Weight]
339.79 | [MOL File]
16903-35-8.mol |
| Chemical Properties | Back Directory | [Appearance]
golden to yellowish brown crystals or powder | [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
| [Stability:]
Stable. Hygroscopic. Light sensitive. Incompatible with strong bases, sulfides, cyanides, carbonates. | [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) | [InChIKey]
FAGGMVVGLLFOQV-UHFFFAOYSA-J | [CAS DataBase Reference]
16903-35-8(CAS DataBase Reference) | [EPA Substance Registry System]
16903-35-8(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
C,Xi | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin .
R43:May cause sensitization by skin contact.
R34:Causes burns.
R36/38:Irritating to eyes and skin .
R23:Toxic by inhalation. | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36/37:Wear suitable protective clothing and gloves . | [RIDADR ]
UN 3260 8/PG 3
| [WGK Germany ]
3
| [RTECS ]
CK6330000 | [F ]
3-8-10 | [TSCA ]
Yes | [HazardClass ]
8 | [PackingGroup ]
III |
| Questions And Answer | Back Directory | [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. |
| Hazard Information | Back Directory | [Chemical Properties]
golden to yellowish brown crystals or powder | [Uses]
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. | [Properties and Applications]
Chloroauric acid is an orange-yellow crystal that is very easy to deliquesce and soluble in water. It decomposes into gold when heated. The aqueous solution of chloroauric acid contains square planar [AuC14]- ions, from which many salts containing planar square ions [AuX4]- (X=F, Cl, Br, I, CN, SCN, NO3) can be prepared. It can be used for local gold plating of semiconductor and integrated circuit lead frames, gold plating of printed circuit boards, electronic connectors and other electrical contact components. It can also be used to make red glass. It is used as an analytical reagent, specifically for microanalysis of clocks and absolutes and measurement of alkaloid composition. It is also used for photographic materials. Chloroauric acid salts, especially sodium chloroaurate NaAuCl4 (prepared by the reaction of AuCls and NaCl), can replace toxic mercury (II) salts as catalysts for alkyne reactions. At the same time, chloroauric acid has important applications in the preparation of nano-level gold. Generally, the fluorescent nano-gold prepared by direct reduction of chloroauric acid with a reducing agent has important applications in analytical chemistry. | [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.] |
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