(1)碳、钠
(2)Na 2CO 3+2HCl=2NaCl+H 2O+CO 2↑
(3)2CO 2+2Na 2O 2=2Na 2CO 3+O 2
(4)Na 2O 2+S 2-+2H 2O=4OH -+S↓+2Na +
略