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Potassium alum

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Potassium alum

Molecular formula: AlKO8S2 CAS# 10043-67-1
Categories: Inorganic salt , Double salt
PubChem CID: 24856 | ChemSpider ID: 23239 | CHEBI:86463 | CB0689708
Names
English:
ALUMINUM POTASSIUM DISULFATE
Alum, potassium anhydrous
Aluminium potassium bis(sulphate)
Aluminium potassium sulfate (1:1:2)
Aluminum potassium alum
Aluminum potassium sulfate
Aluminum potassium sulfate (1:1:2)
E522
Potash alum
Potassium alum [Wiki]
Sulfuric acid, aluminum potassium salt (2:1:1)(CAS)
aluminum;potassium;disulfate(IUPAC)

Variants of the formula:

KAl(SO4)2
K(+1)Al(+3)(S(+6)O(-2)4)2
$slope(45)K^+/0O`^-\S/O`/`/O/\O^-/0Al^3+/0O`^-\S/O`/\O`\`/O`^-
Elemental composition
Can't show the diagram.
Symbol Element Atomic weight Number of atoms Mass percent

Reactions in which Potassium alum is involved

  • 4KAl(SO4)2 "800^oC"--> 2K2SO4 + 2Al2O3 + 6SO2"|^" + 3O2"|^"
  • KAl(SO4)2 + 3KOH "T"-> Al(OH)3 + 2K2SO4
  • KAl(SO4)2 + 4KOH -> K[Al(OH)4] + 2K2SO4