Chloroauric acid hydrate
CAS 27988-77-8
Chloroauric acid hydrate is the workhorse soluble gold source, supplied at a certified assayed gold content per lot — the precursor behind gold nanoparticle synthesis, plating baths, supported gold catalysts and gold recovery chemistry.
Typical specification
| Molecular formula | HAuCl₄ · xH₂O |
|---|---|
| Molecular weight | 339.79 (anhydrous basis) |
| Purity (metals basis) | ≥ 99.9% |
| Gold content | ≥ 49% (certified per lot) |
| Appearance | Yellow-orange crystals |
| Water solubility | Freely soluble |
| Forms | Crystals or solution at specified Au g/L |
| HS code (export) | 2843300000 |
Lot-specific COA issued with every shipment. SDS and ICP elemental impurity data available on request.
Where HAuCl₄·xH₂O is used
Gold nanoparticle manufacture
The starting material for citrate, seed-mediated and Brust-type syntheses feeding lateral-flow diagnostics, plasmonic materials and catalysis research, where lot-to-lot gold assay consistency governs particle-size reproducibility.
Plating and electronics
Feeds gold electroplating and immersion baths for connectors, wire bonding and semiconductor packaging.
Supported gold catalysts
The deposition-precipitation precursor for Au/TiO₂ and Au/CeO₂ catalysts used in CO oxidation and selective oxidation chemistry.
Storage and shipping
Storage. Store tightly sealed, dark and dry; strongly hygroscopic and corrosive.
Shipping. Corrosive classification applies; shipped in UN-approved packaging. Gold-compound export formalities confirmed per order.
Packaging. 1 g · 5 g · 25 g · 100 g · Solution grades by contained Au weight
Synonyms
- Hydrogen tetrachloroaurate hydrate
- Gold(III) chloride acid hydrate
- HAuCl4 hydrate
- Tetrachloroauric acid hydrate
- Gold chloride solution precursor
Frequently asked questions
Why is the gold content quoted per lot?
Commercial chloroauric acid is a variable hydrate, so contained gold shifts between lots. Each lot is assayed and the invoice settles on assayed metal — you pay for gold, not water.
How is pricing structured?
Quotes reference the day's gold price on assayed contained metal plus a stated conversion charge, lockable at order confirmation.
Are gold compounds harder to export?
Gold-bearing goods carry additional trade formalities in some lanes. We confirm the compliant routing and documentation per destination before accepting the order, so your shipment clears without surprises.
Do you take back spent material?
Yes — residues, spent catalyst and off-spec lots are assayed on receipt and the recovered gold credited against your next order.