K2O + H2O = KOH + H2O
BeO + H2O = Be(OH)2 + H2O
CaO + H2O = Ca(OH)2 + H2O
ZnO + H2O = Zn(OH)2 +H2O
SO3 +H2O = H2SO4
SiO2 = H2O = H2SiO3 ( осадок)
CaO + H3PO4 = Ca3(PO4)2 + 3 H2O
SO3 +2KOH = K2SO4 + H2O
MgO + SO3 = MgSO4 + H2O
ZnO + HNO3 = Zn(NO3)2 + H2O