a/
CO2 + H2O => H2CO3 (axit cacbonic)
SO3 + H2O => H2SO4 (axit sunfuric)
N2O5 + H2O => 2HNO3 (axit nitric)
Na2O + H2O => 2NaOH (natri hidroxit, xút ăn da): dung dịch Bazo
Fe2O3-----Fe(OH)3: sắt (III) hidroxit
MgO------Mg(OH)2: magie hidroxit
b/
Canxi cacbonat: CaCO3
Kali oxit: K2O
Sắt (II) hidroxit: Fe(OH)2
Bari đihirophotphat: Ba(H2PO4)2
Axit clohiric: HCl
Kẽm nitrat: Zn(NO3)2