Ca(OH)2+Na2CO3=2NaOH+CaCO3↓
Ca(OH)2 + Na2CO3 = CaCO3(沉淀) +2 NaOH
Ca(OH)2+Na2CO3=CaCO3+2NaOH
Ca(OH)2+Na2CO3=CaCO3(沉淀符号)+2NaOH