1.Na2CO3+2HCl=2NaCl+H2O+CO2↑
2.AgNO3+HCl=AgCl↓+2HNO3
3.CuSO4+2NaOH=Cu(OH)2↓+Na2SO4
4.SO2+2NaOH=Na2SO3+H2O
题目第四个应该是SO2+2OH-=SO32- +H2O
1.Na2CO3+2HCl=2NaCl+H2O+CO2↑
2.AgNO3+HCl=AgCl↓+2HNO3
3.CuSO4+2NaOH=Cu(OH)2↓+Na2SO4
4.SO2+2NaOH=Na2SO3+H2O
题目第四个应该是SO2+2OH-=SO32- +H2O