Content: 99.0 per cent to 100.5 per cent of AlK(SO4)2,12H2O.
Appearance: Granular powder or colourless, transparent, crystalline masses. Solubility: Freely soluble in water, very soluble in boiling water, soluble in glycerol, practically insoluble in ethanol (96 per cent).
A. Solution S (see Tests) gives the reactions of sulphates. B. Solution S gives the reaction of aluminium. C. Shake 10 ml of solution S with 0.5 g of sodium bicarbonate R and filter. The filtrate gives reaction (a) of potassium.
Solution S : Dissolve 2.5 g in water R and dilute to 50 ml with the same solvent. Appearance of solution: Solution S is clear and colourless. pH: 3.0 to 3.5. Ammonium: Maximum 0.2 per cent. Iron: Maximum 100 ppm. Heavy metals: Maximum 20 ppm.
Aluminum Potassium Sulfate FCC Food Grade
Potassium Alum FCC
AlK(SO4)2·12H2O Formula wt 474.38
INS: 522 CAS: [7784-24-9]
Aluminum Potassium Sulfate occurs as large, transparent crystals or crystalline fragments, or as a white crystalline powder. One gram dissolves in 7.5 mL of water at 25° and in about 0.3 mL of boiling water. Its solutions are acid to litmus. It is insoluble in alcohol, but is freely soluble in glycerin.
Identification: A 1:20 aqueous solution gives positive tests for Aluminum, for Potassium, and for Sulfate. Assay: Not less than 99.5% and not more than 100.5% of AlK(SO4)2·12H2O. Ammonium Salts: Passes test. Fluoride: Not more than 0.003%. Lead: Not more than 3 mg/kg. Selenium: Not more than 0.003%.
Potassium Alum USP
Aluminum Potassium Sulfate USP AlK(SO4)2·12H2O 474.39 Sulfuric acid, aluminum potassium salt (2:1:1), dodecahydrate. Aluminum potassium sulfate (1:1:2) dodecahydrate [7784-24-9]. Anhydrous 258.21 [10043-67-1].
Potassium Alum contains not less than 99.0 percent and not more than 100.5 percent of AlK(SO4)2, calculated on the dried basis.
A: Add 1 N sodium hydroxide drop wise to a solution of it (1 in 20): a precipitate is formed that dissolves in an excess of the reagent. Ammonia is not evolved (distinction from Ammonium Alum).
B: Hold it in a non-luminous flame: a violet color is imparted to the flame.
C: Add 10 mL of sodium bitartrate TS to 5 mL of a saturated solution of it: a white, crystalline precipitate is formed within 30 minutes.
D: A solution (1 in 20) responds to the tests for Aluminum and for Sulfate.
Loss on drying:
Transfer 2.0 g, in a tarred porcelain crucible, to a muffle furnace at 200. Increase the temperature to 400 and dry at 400 to constant weight. Cool in a desiccator, and weigh: it loses between 43.0% and 46.0% of its weight.
the limit is 0.002%.
Add 5 drops of potassium ferro-cyanide TS to 20 mL of a solution (1 in 150): no blue color is produced immediately.
Aluminum Potassium Sulfate Dodecahydrate ACS AR Analytical Reagent
Potash Alum ACS
AlK(SO4)2 . 12H2O
Formula Wt 474.39
CAS Number 7784-24-9
Assay: 98.0-102.0% AlK(SO4)2 .12H2O
Insoluble matter: 0.005%
Chloride (Cl): 5 ppm
Ammonium (NH4): 0.005%
Heavy metals (as Pb): 0.001%
Iron (Fe): 0.001%
Sodium (Na): 0.02%
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.
GLP, cGMP (FDA) Approved, WHO-GMP, ISO 9001: 2015, ISO14001:2015, OHSAS18001:2007, FSSC 22000: 2005, FSSAI, Kosher and Halal Certified.