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7784-24-9

7784-24-9 Structure

7784-24-9 Structure
IdentificationMore
[Name]

Aluminium potassium sulfate dodecahydrate
[CAS]

7784-24-9
[Synonyms]

ALUM
ALUMINIUM POTASSIUM SULFATE
ALUMINIUM POTASSIUM SULFATE 12-WATER
ALUMINIUM POTASSIUM SULFATE DODECAHYDRATE
ALUMINIUM POTASSIUM SULPHATE 12-HYDRATE
ALUMINIUM POTASSIUM SULPHATE DODECAHYDRATE
ALUMINUM POTASSIUM SULFATE
ALUMINUM POTASSIUM SULFATE 12 H2O
ALUMINUM POTASSIUM SULFATE, 12-HYDRATE
ALUMINUM POTASSIUM SULFATE DODECAHYDRATE
ALUMINUM POTASSIUM SULPHATE HYDRATED
ALUM POTASSIUM
ALUM SOLUTION
POTASH ALUM
POTASSIUM ALUM
POTASSIUM ALUM DODECAHYDRATE
POTASSIUM ALUMINIUM SULFATE
POTASSIUM ALUMINIUM SULFATE-12-HYDRATE
POTASSIUM ALUMINIUM SULFATE 12-WATER
POTASSIUM ALUMINIUM SULFATE DODECAHYDRATE
[EINECS(EC#)]

233-141-3
[Molecular Formula]

AlH24KO20S2
[MDL Number]

MFCD00149143
[Molecular Weight]

474.39
[MOL File]

7784-24-9.mol
Chemical PropertiesBack Directory
[Appearance]

white to colourless crystals
[Melting point ]

92 °C(lit.)
[mp ]

92 °C(lit.)
[Boiling point ]

200°C
[density ]

1.757 g/mL at 25 °C(lit.)
[storage temp. ]

Store at RT.
[solubility ]

H2O: soluble0.5M, clear, colorless
[form ]

Solid
[color ]

White
[Specific Gravity]

1.757
[PH]

3.0-3.5 (25℃, 50mg/mL in H2O)
[PH Range]

3.3
[Stability:]

Stable. Incompatible with steel, aluminium, copper, zinc, bases, strong oxidizing agents.
[Odor]

Odorless
[Water Solubility ]

140 G/L (20 ºC)
[Merck ]

14,360
[Uses]

potassium alum (alum) is a cosmetic astringent.
[Uses]

Alum, potassium is also known as aluminum potassium sulfate, this 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. Alum 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.
[CAS DataBase Reference]

7784-24-9(CAS DataBase Reference)
[NIST Chemistry Reference]

potassium aluminum sulfate dodecahydrate(7784-24-9)
Hazard InformationBack Directory
[Chemical Properties]

Aluminum is the most commonly available element in homes and workplaces. Aluminum is readily available for human ingestion through the use of food additives, antacids, buffered aspirin, astringents, nasal sprays, and antiperspirants; from drinking water; from automobile exhaust and tobacco smoke; and from using aluminum foil, aluminum cookware, cans, ceramics, and fi reworks. Workers who are at risk for toxicity are those in refi neries, foundries and also welders and grinders.
[Health Hazard]

Prolonged periods of exposure to aluminum and dust cause symptoms of toxicity that include, but are not limited to, coughing, wheezing, shortness of breath, memory loss, learning diffi culty, loss of coordination, disorientation, mental confusion, colic, heartburn, fl atulence, and headaches. Chronic exposures to alumina dust cause irritation to the eyes,
[Definition]

ChEBI: A hydrate resulting from the the formal combination of anhydrous potassium aluminium sulfate with 12 mol eq. of water.
[Definition]

A group of double salts withthe formula A2SO4.B2(SO4)3.24H2O,where A is a monovalent metal and Ba trivalent metal. The original examplecontains potassium and aluminium(called potash alum orsimply alum); its formula is oftenwritten AlK(SO4)2.12H2O (aluminiumpotassium sulphate-12-water). Ammoniumalum is AlNH4(SO4)2.12H2O,chrome alum is KCr(SO4)2.12H2O, etc.The alums are isomorphous and canbe made by dissolving equivalentamounts of the two salts in waterand recrystallizing.
[Production Methods]

Potassium alum is manufactured by treating bauxite with sulfuric acid and then potassium sulfate. Alternatively, aluminum sulfate is reacted with potassium sulfate.
[General Description]

Aluminum 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.
[Pharmaceutical Applications]

Potassium alum precipitates proteins and is a powerful astringent. The ability to precipitate proteins is utilized in the manufacture of vaccines, where purified proteins are coprecipitated with and adsorbed onto potassium alum.
Potassium alum is often included in preparations used as mouthwashes or gargles and in dermatological preparations, and it may be used as a topical hemostatic, either as a solid or as a solution. Intravesical instillation of potassium alum, typically as a 1% solution, has been used for hemorrhagic cystitis.
[Safety]

Potassium alum is often included in preparations used as mouthwashes or gargles and in dermatological preparations.
Large doses of potassium alum act as an irritant and may be corrosive; gum necrosis and gastrointestinal hemorrhage have occurred. Acute encephalopathy has been reported following bladder irrigation with alum solutions in the treatment of bladder hemorrhage. Anecdotal evidence suggests that this practice should be avoided for patients with renal insufficiency.
[storage]

Store in a cool, dry place in tightly closed containers. Stable under normal temperatures and pressures. When kept for a long time at 60–65°C (or over sulfuric acid) potassium alum dodecahydrate loses water, which is reabsorbed on exposure to air. It becomes anhydrous at about 200°C.
[Purification Methods]

Crystallise it from weak aqueous H2SO4 (ca 0.5mL/g). Its solubility (%) in H2O is 5.7 (0o), 12.0 (20o) and 136.9 (100o).
[Incompatibilities]

Potassium alum is incompatible with strong oxidizing agents, aluminum, copper, steel, and zinc. When it is dispensed in powders with phenol, salicylates, or tannic acid, gray or green colors may be developed owing to traces of iron in the alum.
[Regulatory Status]

GRAS listed. Included in the FDA Inactive Ingredients Database (vaginal; suppository). Included in medicines licensed in the UK.
Safety DataBack Directory
[Hazard Codes ]

Xn,Xi
[Risk Statements ]

R36/38:Irritating to eyes and skin .
R22:Harmful if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin .
R21/22:Harmful in contact with skin and if swallowed .
[Safety Statements ]

S22:Do not breathe dust .
S24/25:Avoid contact with skin and eyes .
S37/39:Wear suitable gloves and eye/face protection .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
S20:When using, do not eat or drink .
S13:Keep away from food, drink and animal feeding stuffs .
S2:Keep out of the reach of children .
[WGK Germany ]

3
[RTECS ]

WS5690000
[TSCA ]

Yes
[HS Code ]

28332990
[Precautions]

Aminocarb decomposes on heating and produces toxic fumes, irritating fumes, and oxides of nitrogen. During handling of aminocarb workers should wear protective clothing, gloves, face shield, breathing protection and avoid open flames.
Raw materials And Preparation ProductsBack Directory
【Raw materials】

Sulfuric acid-->Ammonium bicarbonate-->Aluminum hydroxide-->Ammonium sulfate-->Aluminum sulfate-->Potassium sulfate-->COBALT(III) OXIDE BLACK-->BAUXITE-->alunite-->Aluminum oxide
【Preparation Products】

Pectin-->Chorionic Gonadotropin-->Aluminium sulfate octadecahydrate-->Aluminum Stearate-->ALUMINUM POTASSIUM SULFATE-->STEVIA-->COBALT BLUE-->Hydroxyaluminum distearate-->coagulant TX-203-->Fermentation powder-->JELUTONG
Spectrum DetailBack Directory
[Spectrum Detail]

Aluminium potassium sulfate dodecahydrate(7784-24-9)IR1
Well-known Reagent Company Product InformationBack Directory
[Acros Organics]

Aluminium potassium sulfate dodecahydrate, for analysis, 99.5%(7784-24-9)
[Alfa Aesar]

Aluminum potassium sulfate dodecahydrate, ACS, 98.0-102.0%(7784-24-9)
[Sigma Aldrich]

7784-24-9(sigmaaldrich)
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