Aluminum potassium sulfate dodecahydrate
Basic information
- CAS
7784-24-9- Standard SMILES
O.O.O.O.O.O.O.O.O.O.O.O.O=S(=O)([O-])[O-].O=S(=O)([O-])[O-].[Al+3].[K+]- InChIKey
GNHOJBNSNUXZQA-UHFFFAOYSA-J- Molecular formula
- AlH24KO20S2
- Average molar mass
- 474.4 g/mol
- Monoisotopic mass
- 473.9754804
Overview
Potassium aluminium sulfate dodecahydrate is a hydrate resulting from the the formal combination of anhydrous potassium aluminium sulfate with 12 mol eq. of water. It has a role as a mordant, an astringent and a flame retardant. It is a potassium salt, a hydrate, an aluminium salt and a metal sulfate. It contains an aluminium(3+) and a potassium aluminium sulfate.
Names & identifiers
- Preferred name
- Aluminum potassium sulfate dodecahydrate
- IUPAC
- aluminum;potassium;disulfate;dodecahydrate
- English name
- Aluminium potassium sulfate dodecahydrate
- Molecular formula
- AlH8KO5S
- Molecular weight
- 186.2
Names & synonyms
Aluminum potassium sulfate dodecahydratealuminum;potassium;disulfate;dodecahydrateALUMINUM POTASSIUM SULFATE DODECAHYDRATE [MI]RefChem:556689616-521-77784-24-9Aluminium potassium sulfate dodecahydratePotassium alum dodecahydratePotash alum dodecahydrateAluminum potassium disulfate dodecahydrateAlum, potassium, dodecahydratePotassium aluminum sulfate dodecahydrate
Show more names
POTASSIUM ALUMALUMALUMINUM POTASSIUM SULFATEALUMINIUM POTASSIUM SULFATEPOTASH ALUMAluminum Potassium Sulfate HydratePOTAAluminum potassium
Alum, potassium [USP]Potassium aluminum disulfate dodecahydrateUNII-1L24V9R23SALUMINUM POTASSIUM SULFATE, DODECAHYDRATEAluminum potassium sulfate (AlK(SO4)2), dodecahydratePotassium aluminum sulfate dodecahydrate (KAl(SO4)2.12H2O)MFCD00149143potassium aluminium sulfate dodecahydrate
Properties
Computed structural properties
- Topological polar surface area
- 189 Ų
- Hydrogen bond donors
- 12
- Hydrogen bond acceptors
- 20
- Rotatable bonds
- 0
- Heavy atoms
- 24
- Formal charge
- 0
- Complexity
- 62.2
Experimental & physicochemical properties
Chemical ClassesMetals -> Metals, Inorganic Compounds
Density1.757 @25 °C
Melting Point92.5 °C
Physical DescriptionColorless or white odorless solid; [Merck Index] White odorless solid, soluble in water; [Hawley]
Physicochemical properties
- Melting point
- 92 °C · 92 °C(lit.)
- Boiling point
- 200 °C · 200°C
- Density
- 1.757 g/mL · 1.757 g/mL at 25 °C(lit.)
- bulk density
- 900 kg/m3 · 900kg/m3
- storage temp.
- 5 °C · Store at +5°C to +30°C.
- solubility
- 2 O: · H2O: soluble0.5M, clear, colorless
- form
- Solid
- Specific Gravity
- 1.757 · 1.757
- color
- White
- Odor
- Odorless
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 100% (43 of 43) of all reports.
Not Classified
Aggregated GHS information provided per 43 reports by companies from 2 notifications to the ECHA C&L Inventory.
Hazard information
Regulatory InformationChemical: Sulfuric acid, aluminium potassium salt (2:1:1), dodecahydrate
Other Safety InformationEvaluation - Use of aluminium in antiperspirants
Hazards SummaryA severe eye irritant, based on properties of closely related chemical; [CHEMINFO] May cause irritation; [MSDSonline] See Aluminum potassium sulfate. See Aluminum.
Hazard Classes and CategoriesNot Classified
Safety & protection
Protective Action Criteria (PAC)
110 [mg/m3]
1200 [mg/m3]
7000 [mg/m3]
Safety data
- wgk
- 3
- tsca
- Yes
- rtecs
- WS5690000
- hs_code
- 28332990
- risk_code
- 36/38-22-36/37/38-21/22
- Signal word
- Warning
Chemistry & industry
Uses & manufacturing
Uses
Occurs naturally as efflorescence on alum shale and as feather alum on lava; Used to dress fur skins (one of oldest methods); Forms aluminum potassium sulfate (CAS 10043-67-1) when heated above melting point (92.5 deg C); [Ullmann] The most important alums are aluminum potassium sulfate, aluminum ammonium sulfate, and aluminum sodium sulfate. Aluminum potassium sulfate (hydrated) has the formula KAl(SO4)212H2O. Aluminum sulfate is used as a replacement of the alums. Hydrolysis of the alums yields aluminum hydroxide as a precipitant. Industrial uses include paper sizing, water purification, and textile dyeing (mordant). Alums are also used in pickling, baking powder, fire extinguishers, and astringents. [Britannica]
Fur Dressing and Dyeing [Category: Industry]
Preparing and mounting animal skins (taxidermy) [Category: Hobbies]
Applications
UsesBuffer; floccculating reagent.
UsesAluminium potassium sulfate dodecahydrate is a white crystal that is soluble in water. It is made by roasting alunite in a furnace and then harvesting the product by crystallization. Aluminium potassium sulfate dodecahydrate was used to harden gelatin emulsions by introduction, by bathing the exposed plates prior to development, or by use in the fixing bath. Mixed with citric or other acids, it was also used as a clearing bath to remove developer stains in negatives.
Usespotassium alum (alum) is a cosmetic astringent.
General DescriptionAluminum potassium sulfate dodecahydrate is an inorganic sulfate salt of aluminum and potassium. Linear growth rates of (100), (111) and (110) faces of its crystals have been investigated.
Upstream & downstream products
Upstream raw materials
Related reactions
0 records
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Compound notes
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