Aluminium Potassium Sulphate

Alum BP

Potash Alum BPAluminium Potassium Sulte BPAlK(SO4)2,12H2O__474.4__7784-24-9

DEFINITIONContent99.0 per cent to 100.5 per cent of AlK(SO4)2,12H2O.

CHARACTERSAppearanceGranular powder or colourless, transparent, crystales.SolubilityFreely soluble in water, very soluble in boiling water, soluble in glycerol, practically insoluble in ethanol (96 per cent).

IDENTIFICATIONA. Solution S (see Tests) gives the reactions of sultes.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.

TESTSSolution SDissolve 2.5 g in water R and dilute to 50 ml with the same solvent.Appearance of solutionSolution S is clear and colourless./u>: 3.0 to 3.5.Ammonium: Maximum 0.2 per cent.Iron: Maximum 100 ppm.Heavy metals: Maximum 20 ppm.