Chloroauric acid

Chloroauric acid
Names
	IUPAC name Tetrachloroauric(III) acid
	Other names Hydrogen tetrachloroaurate; Hydrogen tetrachloroaurate(III); Chlorauric acid; Aurochloric acid; Aurate(1−), tetrachloro-, hydrogen, (SP-4-1)-; Hydrogen aurichloride; brown gold chloride;
Identifiers
CAS Number	16903-35-8 ; 16961-25-4 (trihydrate) ;
3D model (JSmol)	Interactive image;
ChemSpider	26171 ;
ECHA InfoCard	100.037.211
EC Number	240-948-4;
PubChem CID	28133;
UNII	8H372EGX3V ; 31KV0KH4AY (trihydrate) ;
CompTox Dashboard (EPA)	DTXSID701014499 DTXSID90156444, DTXSID701014499 ;
	InChI InChI=1S/Au.4ClH/h;41H/q+3;;;;/p-3 Key: VDLSFRRYNGEBEJ-UHFFFAOYSA-K ; InChI=1/Au.4ClH.Na/h;41H;/q+3;;;;;+1/p-4/rAuCl4.Na/c2-1(3,4)5;/q-1;+1 Key: IXPWAPCEBHEFOV-ACHCXQQJAP; InChI=1/Au.4ClH/h;4*1H/q+3;;;;/p-3/rAuCl4/c2-1(3,4)5/q-1/p+1 Key: VDLSFRRYNGEBEJ-ZXMCYSOYAI;
	SMILES [H+].Cl[Au-](Cl)(Cl)Cl;
Properties
Chemical formula	H[AuCl4]
Molar mass	339.785 g/mol (anhydrous); 393.833 g/mol (trihydrate); 411.85 g/mol (tetrahydrate);
Appearance	orange-yellow needle-like hygroscopic crystals
Density	3.9 g/cm3 (anhydrous); 2.89 g/cm3 (tetrahydrate)
Melting point	254 °C (489 °F; 527 K) (decomposes)
Solubility in water	350 g of H[AuCl4] in 100 g of H2O
Solubility	soluble in alcohol, ester, ether, ketone
log P	2.67510
Conjugate base	Tetrachloroaurate(III)
Structure
Crystal structure	monoclinic
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314, H317, H373, H411
Precautionary statements	P260, P261, P264, P272, P280, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P333+P313, P363, P405, P501
NFPA 704 (fire diamond)	3 0 1
Safety data sheet (SDS)	JT Baker
Related compounds
Other anions	Tetrabromoauric acid
Related compounds	Gold(III) chloride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Chloroauric acid is an inorganic compound with the chemical formula H[AuCl₄]. It forms hydrates H[AuCl₄]·nH₂O. Both the trihydrate and tetrahydrate are known. Both are orange-yellow solids consisting of the planar [AuCl₄]⁻ anion. Often chloroauric acid is handled as a solution, such as those obtained by dissolution of gold in aqua regia. These solutions can be converted to other gold complexes or reduced to metallic gold or gold nanoparticles.

Names

IUPAC name Tetrachloroauric(III) acid
Other names Hydrogen tetrachloroaurate Hydrogen tetrachloroaurate(III) Chlorauric acid Aurochloric acid Aurate(1−), tetrachloro-, hydrogen, (SP-4-1)- Hydrogen aurichloride brown gold chloride
Identifiers
CAS Number	16903-35-8^Y 16961-25-4 (trihydrate)^Y
3D model (JSmol)	Interactive image
ChemSpider	26171^Y
ECHA InfoCard	100.037.211
EC Number	240-948-4
PubChem CID	28133
UNII	8H372EGX3V^Y 31KV0KH4AY (trihydrate)^Y
CompTox Dashboard (EPA)	DTXSID701014499 DTXSID90156444, DTXSID701014499
InChI InChI=1S/Au.4ClH/h;41H/q+3;;;;/p-3^Y Key: VDLSFRRYNGEBEJ-UHFFFAOYSA-K^Y InChI=1/Au.4ClH.Na/h;41H;/q+3;;;;;+1/p-4/rAuCl4.Na/c2-1(3,4)5;/q-1;+1 Key: IXPWAPCEBHEFOV-ACHCXQQJAP InChI=1/Au.4ClH/h;4*1H/q+3;;;;/p-3/rAuCl4/c2-1(3,4)5/q-1/p+1 Key: VDLSFRRYNGEBEJ-ZXMCYSOYAI
SMILES [H+].Cl[Au-](Cl)(Cl)Cl
Properties
Chemical formula	H[AuCl₄]
Molar mass	339.785 g/mol (anhydrous) 393.833 g/mol (trihydrate) 411.85 g/mol (tetrahydrate)
Appearance	orange-yellow needle-like hygroscopic crystals
Density	3.9 g/cm³ (anhydrous) 2.89 g/cm³ (tetrahydrate)
Melting point	254 °C (489 °F; 527 K) (decomposes)
Solubility in water	350 g of H[AuCl₄] in 100 g of H₂O
Solubility	soluble in alcohol, ester, ether, ketone
log P	2.67510
Conjugate base	Tetrachloroaurate(III)
Structure
Crystal structure	monoclinic
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314, H317, H373, H411
Precautionary statements	P260, P261, P264, P272, P280, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P333+P313, P363, P405, P501
NFPA 704 (fire diamond)	3 0 1
Safety data sheet (SDS)	JT Baker
Related compounds
Other anions	Tetrabromoauric acid
Related compounds	Gold(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references