2NaOH + SO3 -> Na2SO4 + H2O
2KOH + MgSO4 -> Mg(OH)2 + K2SO4
Ba(OH)2 + 2HCl -> BaCl2 + 2H2O
Cu(OH)2 is not a reaction as it is a single compound.
2NaOH + SO3 -> Na2SO4 + H2O
2KOH + MgSO4 -> Mg(OH)2 + K2SO4
Ba(OH)2 + 2HCl -> BaCl2 + 2H2O
Cu(OH)2 is not a reaction as it is a single compound.