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FeO+2HCl=FeCl2+H2O FeO+ 2H⁺+2Cl⁻=Fe²⁺+2Cl⁻+H2O FeO+2H⁺=Fe²⁺+H2O Cu(OH)2+H2SO4=CuSO4+2H2O Cu(OH)2+2H⁺+SO4²⁻=Cu²⁺+SO4²⁻+2H2O Cu(OH)2+2H⁺=Cu²⁺+2H2O