Molekula
Tetrachloroaurate (III) acid
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Tetrachloroaurate (III) acid (HAuCl4) is a gold(III) chloride complex dissolved in hydrochloric acid, widely used in electronics for gold plating, catalysis, and as a precursor in nanotechnology and chemical synthesis. It appears as a yellow to red-brown solution, highly soluble in water and polar solvents. This hazardous chemical requires careful handling due to its corrosive and toxic properties. CAS 16903-35-8 | Molecular formula HAuCl4 | Molecular weight 339.79 g/mol | Storage at ambient conditions | Signal word: Danger. Molekula supplies Tetrachloroaurate (III) acid from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 g — £229.10 per pack ex VAT · £274.92 inc. VAT
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Specifications
| Property | Value |
|---|---|
| Appearance | Gold or yellow red crystal |
| Purity | ≥99.9% |
| Iron (Fe) | ≤0.005% |
| Lead (Pb) | ≤0.0005% |
| Calcium (Ca) | ≤0.005% |
| Copper (Cu) | ≤0.005% |
| Magnesium (Mg) | ≤0.005% |
| Zinc (Zn) | ≤0.005% |
| Chromium (Cr) | ≤0.005% |
| Manganese (Mn) | ≤0.005% |
| Silver (Ag) | ≤0.005% |
| Aluminium (Al) | ≤0.005% |
| Silicon (Si) | ≤0.005% |
| Gold (Au) | ≥50% |
| Platinum (Pt) | ≤0.005% |
| Ruthenium (Ru) | ≤0.005% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | III |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 10189401 |
| CAS Number | 16903-35-8 |
| Molecular Formula | HAuCl4 |
| Molecular Weight | 339.79 |
| SMILES | [H+].[Cl-][Au+3]([Cl-])([Cl-])[Cl-] |
| UN Number | UN3260 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2843300000 |
| Tariff Code | 2843300000 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
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Hazardous to the Environment
GHS09
Hazard statements
- EUH071 Corrosive to the respiratory tract
- H290 May be corrosive to metals
- H302 Harmful if swallowed
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H373 May cause damage to organs through prolonged or repeated exposure
- H411 Toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P304+312 IF INHALED: Call a POISON CENTER or doctor/physician if you feel unwell
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
No alternate names recorded for this product.
Frequently asked questions
What is Tetrachloroaurate (III) acid (HAuCl4) commonly used for?
Tetrachloroaurate (III) acid is primarily used in gold plating, electronics manufacturing (e.g., semiconductor fabrication), and as a precursor for gold nanoparticle synthesis in research and industrial applications.
What is the molecular formula and molecular weight of Tetrachloroaurate (III) acid?
The molecular formula is **HAuCl₄**, and the molecular weight is **339.79 g/mol**.
What safety classification does Tetrachloroaurate (III) acid fall under?
It is classified with the **signal word 'Danger'** due to its corrosive and hazardous properties. Always handle with appropriate PPE and ventilation.
How should Tetrachloroaurate (III) acid be stored?
Store in a **cool, dry place at ambient temperature**, away from incompatible substances (e.g., strong oxidizers, metals). Keep containers tightly sealed.
Does Molekula supply Tetrachloroaurate (III) acid in bulk quantities?
Yes, we offer **bulk quantities** of Tetrachloroaurate (III) acid, with flexible packaging options (e.g., drums, bottles) based on customer requirements.
What documentation is provided with an order of Tetrachloroaurate (III) acid?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a **compliance certificate** for purity and traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.