Câu 3 Hoàn thành phương trình hóa học 
1. KOH+SO3--->........+H2O
2. NaOH+HNO3--->......+H2O
3. Ca(OH)2+CO2--->.......+H2O
4. Na2 Co3+BaCl2--->.....BaCO3+
5.  CO2+KOH--->......+H2O
6. Na2CO3+BaCl2--->BaCO3+.....
7.Cu+.....Cu(NO3)2+Ag
8. KOH+MgSO4---->.........+H2O
9. NaOH+CO2--->......+BaSO4
10. Na2SO4+BaCl2---->......BaSO4
11.Fe+CuSO4--->......Cu
12. CuO+HCl--->.....H2O
13 . ZnO+HNO3--->.....+H2O
14.Al2O3+HCl--->.....+H2O
15. Fe2O3+HNO3--->.....+H2O
16.Al2O3+H2SO4---->......+H2O
17. Mg(OH)2+H2SO4---->......+H2O
18.Cu+.....---->Cu(NO3)2+Ag
19.Mg+Al2(SO4)3--->.....+Al
20.Al+H2SO4---->....+H2