Chloroauric Acid Solution

Basic Information of Chloroauric Acid Solution

CAS No.	16903-35-8
EC No.	240-948-4
Chemical Formula	HAuCl₄ (aq.)
Molecular Weight	339.79 g/mol (anhydrous basis)
Appearance	Clear to yellow-orange liquid (aqueous solution, typically 10–50% Au w/w)
Odor	Odorless to slight chlorine
Melting point	Not applicable (liquid solution)
Boiling point	>100 °C (water-based; decomposes on heating)
Density	1.2–2.0 g/mL at 25 °C (concentration-dependent)
Solubility	Miscible with water; soluble in alcohols, acetone, ethyl acetate
Nature (hazards)	Corrosive to metals and skin, causes severe skin burns and eye damage, harmful if swallowed or inhaled, toxic to aquatic life
RIDADR	UN 3264, Corrosive liquid, acidic, inorganic, n.o.s. (Chloroauric acid solution), Class 8, Packing Group II
Chemical Structure

Primary Applications of Chloroauric Acid Solution

Chloroauric Acid Solution provides a clean, ready-to-use Au(III) source for reduction and deposition processes in nanotechnology and surface finishing.

1. Gold Nanoparticle Synthesis
   Serves as the primary gold source for controlled reduction to monodisperse Au nanoparticles using citrate or borohydride, critical for biosensors, drug delivery, and plasmonic applications.

2. Gold Electroplating & Surface Finishing
   Supplies Au(III) ions for electrolytic and electroless gold plating baths, producing bright, corrosion-resistant coatings on electronics, connectors, and jewelry.

3. Supported Gold Catalyst Preparation
   Used in impregnation or deposition to create Au on carbon, alumina, or oxide supports for selective oxidation, hydrogenation, and CO removal in fine chemicals.

4. Thin-Film Gold Deposition
   Ideal for spin-coating or ink formulations to produce gold electrodes, seed layers, or conductive films in microelectronics and sensors.

5. Organometallic Gold Complex Synthesis
   Acts as a precursor for preparing Au(III) and reduced Au(I) complexes with phosphines or carbenes in catalysis and materials research.

6. Advanced Materials & Nanotechnology
   Facilitates gold nanoshell, nanorod, or composite material synthesis for photothermal therapy, SERS substrates, and functional coatings.

• Accurate & Consistent Au Concentration
  Precise analytical control ensures uniform gold content, low impurities, and batch reproducibility for reliable reduction or deposition performance.

• Secure Gold Sourcing
  Transparent, responsible gold procurement with inventory buffering to provide supply stability and competitive pricing.

• Technical Process Support
  Dedicated specialists provide advice on reduction protocols, plating bath formulation, nanoparticle stabilization, and optimization for maximum efficiency.

• Regulatory & Sustainability Focus
  Full COA, REACH, RoHS, SDS documentation and gold recycling programs to support global compliance and ESG commitments.

Hazards Classification

• GHS Classification: Skin Corrosion (Category 1A); Serious Eye Damage (Category 1); Acute Toxicity, Oral (Category 3); Acute Toxicity, Inhalation (Category 3); Aquatic Chronic (Category 1)

• Hazard Statements: H314: Causes severe skin burns and eye damage; H301 + H331: Toxic if swallowed or if inhaled; H410: Very toxic to aquatic life with long lasting effects

• UN Number: UN 3264

• Hazard Class: 8 (Corrosive substances)

• Packing Group: II