Fe2O3+3H2O<==>2Fe(OH)3
CuO+H2O=Cu(OH)2
Mg+H2SO4=MgSO4+H2
MgSO4+2H2O=Mg(OH)2+H2SO4
Mg(OH)2+2HCl=MgCl2+2H2O
CuO+2HCl=CuCl2+H2O
CuCl2+2KOH=Cu(OH)2+2KCl
Cu(OH)2+H2SO4=CuSO4+2H2O
Fe2O3+3H2O<==>2Fe(OH)3
CuO+H2O=Cu(OH)2
Mg+H2SO4=MgSO4+H2
MgSO4+2H2O=Mg(OH)2+H2SO4
Mg(OH)2+2HCl=MgCl2+2H2O
CuO+2HCl=CuCl2+H2O
CuCl2+2KOH=Cu(OH)2+2KCl
Cu(OH)2+H2SO4=CuSO4+2H2O