KOH + SO3 -> 2K+ + SO3^2- + H2OKOH + Cu(OH)2 -> Cu(OH)2 + K+ + OH- + H2O2H+ + Cu(OH)2 -> Cu^2+ + 2H2O2H+ + BaO -> Ba^2+ + H2O2H+ + CaO -> Ca^2+ + H2OSO3 + BaO -> Ba^2+ + SO4^2-
KOH + SO3 -> 2K+ + SO3^2- + H2O
KOH + Cu(OH)2 -> Cu(OH)2 + K+ + OH- + H2O
2H+ + Cu(OH)2 -> Cu^2+ + 2H2O
2H+ + BaO -> Ba^2+ + H2O
2H+ + CaO -> Ca^2+ + H2O
SO3 + BaO -> Ba^2+ + SO4^2-