Alum is a double salt that is obtained from aluminum. It is used in pickling process and the dying of various fabrics by recycling aluminum useful products can be obtained from previous material generally regarded as refuse.
Aluminum foil, aqueous solution of KOH
Dissolve aluminum foil in hot aqueous solution of KOH.
The solution will acidify until a precipitate will be recovered (alum)
Re-crystallize the precipitate to eliminate impunities.
– Na + O2→Na2O2
– Na2O2 +2H2O→H2O2+2NaOH
– Cesium would be more reactive than sodium.
– 2Mg + O2→2MgO
– Magnesium oxide + water →Mg(