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Ammonium aluminium sulfate

Ammonium aluminium sulfate, also known as ammonium alum or just alum, is a white crystalline double sulfate usually encountered as the dodecahydrate, formula (NH4)Al(SO4)2·12H2O. It is used in small amounts in a variety of niche applications. The dodecahydrate occurs naturally as the rare mineral tschermigite.

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Further Information

Names

Other names

Ammonium alum

Identifiers

CAS Number: 7784-25-0

JSmol: Interactive image

ChemSpider: 2297489

ECHA InfoCard: 100.029.141

EC Number: 232-055-3 616-522-2 (dodecahydrate)

E number: (acidity regulators, …)

KEGG: D02842

PubChem: 3032540

RTECS number: WS5640010

UNII: DPU64XYB1D

Properties

Chemical formula: (NH)Al(SO)442

Molar mass: 237.15 g/mol (anhydrous)
453.33 g/mol (dodecahydrate)

Appearance: white crystals

Density: 2.45 g/cm (anhydrous)
1.64 g/cm (dodecahydrate)33

Melting point: 93.5 °C (200.3 °F; 366.6 K) (dodecahydrate)

Boiling point: dehydr.

Solubility in water: 15 g/100 ml (20 °C, dodecahydrate)

Structure

Crystal structure: Hexagonal (anhydrous)
Cubic (dodecahydrate)

Coordination geometry: Octahedral (Al)

Hazards

Safety data sheet: External MSDS

GHS pictograms:

GHS signal word: WARNING

GHS hazard statements: H315 H319

GHS precautionary statements: P264 P280 P302+352 P305+351+338 P321 P332+313 P337+313 P362

Flash point: Non-flammable

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).