Chrome alum

Potassium chromium sulfate
Names
	IUPAC name Chromium potassium sulfate
	Other names Chromium alum
Identifiers
CAS Number	10141-00-1;
3D model (JSmol)	Interactive image;
ChemSpider	19968602;
ECHA InfoCard	100.030.352
EC Number	233-401-6;
MeSH	chrome+alum
PubChem CID	61489;
RTECS number	GB6845000;
UNII	579U79PAIC ;
CompTox Dashboard (EPA)	DTXSID00890645 ;
	InChI InChI=1S/Cr.K.2H2O4S/c;;21-5(2,3)4/h;;2(H2,1,2,3,4)/q+3;+1;;/p-4 Key: OIDPCXKPHYRNKH-UHFFFAOYSA-J; InChI=1/Cr.K.2H2O4S/c;;21-5(2,3)4/h;;2(H2,1,2,3,4)/q+2;+1;;/p-4 Key: HIZQQXDAMAATMK-XBHQNQODAZ;
	SMILES [K]OS(=O)(=O)O[Cr]1OS(=O)(=O)O1;
Properties
Chemical formula	KCr(SO4)2
Molar mass	283.220 g/mol
Appearance	dark purple needles or greyish-brown powder when anhydrous
Density	1.83 g cm−3
Melting point	89 °C (192 °F; 362 K)
Boiling point	400 °C (752 °F; 673 K)
Solubility in water	24 g/100mL (at 20 °C)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319
Precautionary statements	P305+P351+P338
Structure
Crystal structure	cubic
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chrome alum or Chromium(III) potassium sulfate is the potassium double sulfate of chromium. Its chemical formula is KCr(SO₄)₂ and it is commonly found in its dodecahydrate form as KCr(SO₄)₂·12(H₂O). It is used in leather tanning.

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