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Potassium Alum

Aluminum Potassium Sulfate, Potash Alum BP USP FCC ACS Reagent Grade Supplier, Manufacturer's Representative

CAS number : 7784-24-9
Chemical Formula: AlK(SO4)2,12H2O

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DESCRIPTION

Alum BP
Potash Alum BP, Aluminium Potassium Sulphate BP
Formula: AlK(SO4)2,12H2O
Weight: 474.4
CAS Number: 7784-24-9

DEFINITION
Content: 99.0 per cent to 100.5 per cent of AlK(SO4)2,12H2O.

CHARACTERS
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).

IDENTIFICATION
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.

TESTS
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.

Potassium Alum USP
Aluminum Potassium Sulfate USP
Formula: AlK(SO4)2·12H2O
Weight: 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.

Identification: 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.
Heavy metals: the limit is 0.002%.
Iron: 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 FCC Food Grade
Potassium Alum FCC
Aluminum Potassium Sulfate FCC

Formula: AlK(SO4)2·12H2O
Weight: 474.38
INS: 522
CAS: 7784-24-9

DESCRIPTION
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.
Function Buffer; neutralizing agent; firming agent.

REQUIREMENTS
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%.

Aluminum Potassium Sulfate Dodecahydrate ACS AR Analytical Reagent
Potash Alum ACS
Formula: AlK(SO4)2 . 12H2O
Weight: 474.39
CAS Number: 7784-24-9

REQUIREMENTS
Assay: 98.0-102.0% AlK(SO4)2 .12H2O

MAXIMUM ALLOWABLE
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%


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