2Al(s)+2KOH(aq)+6H2O(l)= 2KAl(OH)4(aq)+3H2(g)

2KAl(OH)4(aq)+H2SO4=2Al(OH)3+K2S04+2H20

2Al(OH)3 (s) +3H2SO4 (aq)=Al2(SO4)3 (aq)+6H20(l)

Al2(S04)3 (aq)+K2SO4 (aq)+24H2O (l)=2Al(SO4)2 X 12H2O (s)