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Aluminium potassium sulphate dodecahydrate
Product Identifier
| Product Name |
Aluminium potassium sulphate dodecahydrate |
| Specifications |
Meets USP 41- NF 36, EP 9.0, JP 17 and BP 2016 testing specifications |
| Product Code |
TC552M |
| Molecular weight |
474.39 |
| Molecular formula |
AlK(SO4)2.12H2O |
| CAS No. |
7784-24-9 |
| Synonym |
Potassium alum dodecahydrate |
Technical Specification
| Appearance (USP) |
Large, colorless crystals, crystalline fragments, or white powder |
| Appearance (EP, BP) |
Granular powder or colourless, transparent, crystalline masses |
| Appearance (JP) |
Colourless or white crystals or powder |
| Solubility (USP) |
Very soluble in boiling water. Freely soluble in water and in glycerin; insoluble in alcohol |
| Solubility (EP, BP) |
Freely soluble in water, very soluble in boiling water, soluble in glycerol, practically insoluble in ethanol (96%). |
| Solubility (JP) |
Freely soluble in water, and practically insoluble in ethanol (95%) and in diethyl ether |
| Identification A : (USP) |
A precipitate is formed that dissolves in an excess of the reagent |
| Identification A : (EP, BP) |
Gives the reaction of sulfates |
| Identification : (JP) |
Complies |
| Identification B : (USP) |
A violet color is imparted to the flame |
| Identification B : (EP, BP) |
Solution S gives the reaction of aluminium |
| Identification C: (USP) |
A white crystalline precipitate is formed within 30 min |
| Identification C: (EP, BP) |
The filtrate gives reaction (a) of potassium |
| Identification D: (USP) |
Meets the requirements |
| Appearance of solution : (EP, ВР) |
5% solution in water is clear and colourless |
| pH (10% in water at 25°C) : (EP, BP) |
3.00-3.50 |
| Ammonium: (EP, BP) |
<= 0.20% |
| Iron (EP, BP) |
<= 0.01% |
| Iron (USP) |
No blue colour is produced immediately |
| Iron (JP) |
<= 0.0020% |
| Heavy metals (USP, BP, JP) |
<= 0.0020% |
| Arsenic : (JP) |
<= 0.00033% |
| Loss on drying : (USP) |
43.00 - 46.00% (at 200°, increase the temperature to 400° and dry at 400° to constant weight) |
| Assay (EDTA-Back Titration, dried basis) |
99.00-100.50% |
| Assay (EDTA Titration) : (EP, BP) |
99.00-100.50% |
| Assay (EDTA-Back Titration) : (JP) |
min. 99.50% |
Storage and Shelf Life
| Storage |
Store at 10-30°C away from bright light |
| Shelf life |
48 months |
| Usage |
Use before expiry date given on the product label |
CAS Number :
7784-24-9
Synonym :
Potassium alum dodecahydrate
Molecular Formula :
AlK(SO₄)₂.12H₂O
More Information
| Product Name |
Aluminium potassium sulphate dodecahydrate |
| SKU |
TC552M |
| CAS No |
7784-24-9 |
| EC No. |
233-141-3 |
| Molecular formula |
AlK(SO₄)₂.12H₂O |
| Synonym |
Potassium alum dodecahydrate |