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Chrome alum

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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Further Information

Names

Preferred IUPAC name: Chromium potassium sulfate

Other names

Chromium alum

Identifiers

CAS Number: 10141-00-1

JSmol: Interactive image

ChemSpider: 19968602

ECHA InfoCard: 100.030.352

EC Number: 233-401-6

MeSH: chrome+alum

PubChem: 61489

RTECS number: GB6845000

UNII: 579U79PAIC

Properties

Chemical formula: KCr(SO)42

Molar mass: 283.220 g/mol

Appearance: dark purple needles or greyish-brown powder when anhydrous

Density: 1.83 g cm

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 pictograms:

GHS signal word: WARNING!

GHS hazard statements: H315 H319

GHS precautionary statements: P305+351+338

Structure

Crystal structure: cubic

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).

Infobox references