Gold(III) chloride trihydrate
Gold(III) chloride trihydrate (CAS: 16961-25-4), with the linear formula HAuCl₄ · 3H₂O and a molecular weight of 393.83, is a vital inorganic compound. This bright yellow crystalline solid serves primarily as a precursor in the synthesis of gold catalysts, finding significant application in 21st-century chemical advancements. It is a key reagent in organic synthesis and various industrial processes requiring precise gold deposition or catalytic activity.
- IUPAC
- Hydrogen tetrachloroaurate(III),Tetrachloroauric(III) acid
- Synonyms
- Hydrogen tetrachloroaurate(III)Tetrachloroauric(III) acid

Gold Catalysis
Utilised as a precursor for the synthesis of heterogeneous and homogeneous gold catalysts, enabling crucial reactions in organic chemistry and materials science. These catalysts are instrumental in processes like oxidation, reduction, and C-C bond formation.
Chemical Synthesis
Serves as a versatile reagent in inorganic and organic synthesis, facilitating the introduction of gold into complex molecules. Its reactivity makes it valuable for creating gold-containing complexes and materials with unique electronic or catalytic properties.
Electroplating and Surface Finishing
Can be employed in specialized electroplating baths for depositing thin gold layers onto various substrates. This is important for applications requiring corrosion resistance, conductivity, or decorative finishes in electronics and jewellery.
Research and Development
A fundamental chemical for academic and industrial research exploring new catalytic systems, nanomaterials, and advanced chemical processes involving gold.
| Molecular weight | 393.83 |
|---|---|
| Linear formula | HAuCl4 · 3H2O |
| Assay | ≥49.0% Au basis |
| Grade | ACS reagent |
| Impurities tested | ≤0.1% Insoluble in ether |
| Application | Gold Catalysts — 21st Century ′Gold Rush′ |


Hazard statements
- H314Causes severe skin burns and eye damage
- H317May cause an allergic skin reaction
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Transport (UN / ADR) | UN 3260 8 / PGII |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | C |
| Risk statements (R) | 34-43 |
| Safety statements (S) | 26-27-36/37/39-45 |
| Cation traces | alkalies and other metals (as sulfates): ≤0.2% |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Quality Level | PREMIUM |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Gold(III) chloride trihydrate used for?
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Gold(III) chloride trihydrate is primarily used as a precursor in the synthesis of gold catalysts for various chemical reactions, in organic and inorganic synthesis, and in specialized electroplating applications.
What is the CAS number and formula for Gold(III) chloride trihydrate?
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The CAS number is 16961-25-4 and the linear formula is HAuCl₄ · 3H₂O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Gold(III) chloride trihydrate in ACS reagent grade, with an assay of ≥49.0% Au basis. We do not represent this product as USP, BP, or EP grade.
How should Gold(III) chloride trihydrate be handled safely?
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Gold(III) chloride trihydrate is a dangerous substance. It causes severe skin burns and eye damage (H314) and may cause an allergic skin reaction (H317). Handle with extreme care, using appropriate personal protective equipment, including gloves, eye protection, and protective clothing. Ensure adequate ventilation and avoid contact with skin, eyes, and clothing. In case of contact, rinse immediately and seek medical advice.
How is this chemical exported and shipped?
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Gold(III) chloride trihydrate is shipped as a dangerous good under UN 3260, Hazard Class 8, Packing Group II. TSS ensures compliance with all international shipping regulations for hazardous materials.
How can I request a sample or quote for Gold(III) chloride trihydrate?
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Please contact our sales team via the website or by phone to request a sample or a detailed quotation for Gold(III) chloride trihydrate.
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