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Ammonium persulfate

Ammonium persulfate (APS) is the inorganic compound with the formula (NH4)2S2O8. It is a colourless (white) salt that is highly soluble in water, much more so than the related potassium salt. It is a strong oxidizing agent that is used in polymer chemistry, as an etchant, and as a cleaning and bleaching agent.
The dissolution of the salt in water is an endothermic process.

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Further Information

Names

Other names

Ammonium peroxydisulfate

Identifiers

CAS Number: 7727-54-0

JSmol: Interactive image

ChemSpider: 56400

ECHA InfoCard: 100.028.897

EC Number: 231-786-5

E number: (glazing agents, …)

PubChem: 62648

RTECS number: SE0350000

UNII: 22QF6L357F

UN number: 1444

Properties

Chemical formula: (NH)SO4228

Molar mass: 228.18 g/mol

Appearance: white to yellowish crystals

Density: 1.98 g/cm

Melting point: 120 °C (248 °F; 393 K) decomposes

Solubility in water: 80 g/100 mL (25 °C)

Solubility: Moderately soluble in MeOH

Hazards

Safety data sheet: External MSDS

EU classification: O

R-phrases: R8 R22 R36/37/38 R42/43

S-phrases: (S2) S22 S24 S26 S37

NFPA 704:

median dose: 689 mg/kg, oral (rat)

Related compounds

anions: Ammonium thiosulfate

cations: Sodium persulfate

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).