(1)CaC 2,
(2)2Na 2O 2+2CO 2=2Na 2CO 3+O 2
(3)Ca(OH) 2+CO 3 2-=CaCO 3+2OH -
(4)3OH -+2CO 2=HCO 3 -+CO 3 2-+H 2O
(5)5:1
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