1.CaCl2
2.Fe2O3
3.HBr
4.Fe(NO3)2
5.Mn(OH)2
6.Ba(OH)2
7.CO2
FeCl2+NaOH----Fe(OH)2+2NaCl
Fe2++2Cl-+2Na++ 2OH-=Fe(OH)⬇+2Na++2Cl
Fe2++2OH-=Fe(OH)⬇
Ba(OH)2+2HNO3=Ba(NO3)2+2H2O
Ba2++2OH-+2H++2NO3-=Ba2++2NO3-+2H2O
2H++2OH-=2H2O
MgCl2+Na2SiO3=MgSiO3+2NaCl
FeCl2+2H2O=Fe(OH)2+2HCl
NaOH+HNO3=NaNO3+H2O