An alum is a type of chemical compound, usually a hydrated double sulfate salt of aluminium. It often refers to potassium alum, with the formula KAl(SO4)2·12H2O.
The most widely used alum is potassium alum. It was used since antiquity as a flocculant to clarify turbid liquids. Used as pickling agent to help keep pickles crisp.
Chemical Name: Aluminium Potassium Sulphate Dodecahydrate
Mol. Formula: AlK(SO4)2.12H2O
Mol. Weight: 474.4 g/mol
CAS No.: 7784-24-9
|Characters||A granular powder or colorless, transparent, crystalline masses|
(a)Gives reaction of sulphates
(b)Gives reaction of aluminum
(c)Shake 10ml of solution with 0.5g of sodium bicarbonate and filter. The filtrate gives the reaction of potassium
|Solubility||Freely soluble in water, very soluble in boiling water, soluble in glycerol, practically insoluble in ethanol 96%|
|Appearance of solution||Solution is clear and colorless|
|pH||The pH of the solution is 3.0-3.5|
|Ammonium||Not more than 0.2%|
|Iron||Not more than 100ppm|
|Heavy Metals||Not more than 20ppm|
|Assay||Not less than 99.0% and not more than 100.5% of AlK(SO4)2,12H2O|
Shelf life, Storage and Packing
It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.
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