NaOH + SO2 -> Na2SO3 (sodium sulfite)
FeO + HCl -> FeCl2 + H2O (iron(II) chloride)
BaO + HCl -> BaCl2 + H2O (barium chloride)
Ca(OH)2 + HNO3 -> Ca(NO3)2 + 2H2O (calcium nitrate)
NaOH + ZnO -> Na2ZnO2 (sodium zincate)
BaCl2 + H2SO4 -> BaSO4 + 2HCl (barium sulfate)
FeSO4 + NaOH -> Fe(OH)2 + Na2SO4 (iron(II) hydroxide)
CuCl2 + NaOH -> Cu(OH)2 + NaCl (copper(II) hydroxide)
NaOH + SiO2 -> Na2SiO3 (sodium silicate)
Al(OH)3 + HCl -> AlCl3 + 3H2O (aluminum chloride)