| Identification | More | [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 Properties | Back Directory | [Appearance]
white to colourless crystals | [Melting point ]
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 | [Odor]
Odorless | [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. | [Water Solubility ]
140 G/L (20 ºC) | [Merck ]
14,360 | [LogP]
-1.031 (est) | [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 Information | Back 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]
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. | [Definition]
ChEBI: A hydrate resulting from the the formal combination of anhydrous potassium aluminium sulfate with 12 mol eq. of water. | [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 Data | Back 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. |
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