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7784-24-9

Name Aluminium potassium sulfate dodecahydrate
CAS 7784-24-9
EINECS(EC#) 233-141-3
Molecular Formula AlH24KO20S2
MDL Number MFCD00149143
Molecular Weight 474.39
MOL File 7784-24-9.mol

Chemical Properties

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)

Safety Data

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.

Hazard Information

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