(1)碳(或C);钠(或Na)
(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 +