Al2O3+ 2NaOH =2NaAlO2 + H2O (сплавление) Al2O3 = A
Al2O3+3H2SO4 = Al2(SO4)3 + 3H2O Al2(SO4)3 = B
Al2(SO4)3 + 3BaCl2 = 2AlCl3 + 3BaSO4 AlCl3 =C
AlCl3 + 3NaOH = Al(OH)3 + 3NaCl Al(OH)3 = D
Al(OH)3+ NaOH =NaAlO2 + 2H2O (сплавление)
2Al(OH)3 = Al2O3 + 3H2O