Цепочка превращений aloh*3=al*2o*3=alcl*3=aloh*3=al*2(so*4)*3=mgso*4

2AL(OH)*3 +t = AL*2O*3+3H*2O
2Al*2O*3+12HCl=4AlCl*3+6H*2O
AlCl*3+3NaOH=Al(OH)*3+3NaCl
2Al(OH)*3 + 3H*2SO*4 = Al*2(SO*4)*3 + 6H*2O
Al*2(SO*4)*3 + 3MgCl*2 = 3MgSO*4 + 2AlCl*3