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Aluminium Sulphate
Widely used in industry for water purification. It is soluble in water, insoluble in alcohol.
| Synonym: | Filter alum, cake alum, alum |
| Chemical Formula: | Al2(SO4)3 |
| Appearance: | White lump and white powder |
| Application: | -As a flocculating agent for water purification
-As a mordant in dyeing and printing
-Used to reduce the PH of garden soil
-As a foaming agent in foam fire extinguisher
-As PH controller in paper industry |
| Physical Properties: | Noncombustible, nontoxic
MP 770 oC
pH 2.9
SG 2.71 |
| Item | Result |
|---|
| A12O3 (%) | 17
|
| Fe (%) | 0.007
|
| As (%) | 0.3
|
| Pb(%) | 0.0005
|
| Water Insoluble (%) | 0.002 |