Alum BP
Abstract
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.
Use/Application
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.
Identity
Chemical Name: Aluminium Potassium Sulphate Dodecahydrate
Mol. Formula: AlK(SO4)2.12H2O
Mol. Weight: 474.4 g/mol
CAS No.: 7784-24-9
General Specifications
| Test | Specification |
| Characters | A granular powder or colorless, transparent, crystalline masses |
| Identification
Test (A) Test (B) Test(C) |
(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.
Other
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We observe WHO Good manufacturing practice and Good laboratory practice.
