Na->NaOH->Na2CO3->NaCl->Na

Question

Na->NaOH->Na2CO3->NaCl->Na

Answer 1

1)2Na+Ba(OH)2=2NaOH+Ba
2)2NaOH+H2CO3=Na2CO3+2H2O
3)Na2CO3+2HCl=2NaCl+H2CO3
4)2NaCl+H2=2HCl+2H2↑