(1)Al 2O 3;
(2)2Na 2O 2+2H 2O==4NaOH+O 2↑
(3)2Na+2H 2O==2Na ++2OH -+H 2↑;2Al+2OH -+2H 2O==2AlO 2 -+3H 2↑
(4)碱;AlO 2 -+2H 2O
Al(OH) 3+OH -
(1)Al 2O 3;
(2)2Na 2O 2+2H 2O==4NaOH+O 2↑
(3)2Na+2H 2O==2Na ++2OH -+H 2↑;2Al+2OH -+2H 2O==2AlO 2 -+3H 2↑
(4)碱;AlO 2 -+2H 2O
Al(OH) 3+OH -