Heelp
Balance the chemical reactions :
Na2O + H2O ---> 2NaOH
K2O + H2O ---> KOH
MgO + H2O ---> Mg(OH)2
CaO + H2O ---> Ca(OH)2
SO2 + H2O ⇄ H2SO3
SO3 + H2O ---> H2SO4