CuO + 2NaHSO4 = CuSO4 + Na2SO4 + H2O CuO + 2H+ = Cu2+ + H2O
ZnO + 2NaHSO4 = ZnSO4 + Na2SO4 + H2O ZnO + 2H+ = Zn2+ + H2O
MgO + 2NaHSO4 = MgSO4 + Na2SO4 + H2O MgO + 2H+ = Mg2+ + H2O
CaO + 2NaHSO4 = CaSO4 + Na2SO4 + H2O CaO + 2H+ = Ca2+ + H2O
FeO + 2NaHSO4 = FeSO4 + Na2SO4 + H2O FeO + 2H+ = Fe2+ + H2O
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