<span>1) Fe--->FeSO4--->Fe(OH)2--->FeO--->Fe--->Fe2(SO)з</span>
Fe+H2SO4=FeSO4+H2
FeSO4+2NaOH=Fe(OH)2+Na2SO4
Fe(OH)2=(t)=FeO+H2O
FeO+H2=Fe+H2O
Fe+H2SO3=FeSO3+H2
2)<span>PbO(2) + HNO(3) + H(2)O -> Pb(NO(3))(2) + H(2)O +O(2)</span>
<span>Pb(+4)O2(-2)+H(+)N(+5)O3(-2)+H2O=Pb(+2)(NO3)2+H2O+O2(0)</span>
<span>Pb(+4)-2e=Pb(+2)_восстановитель</span>
<span>2O(-2)+4=O2(0)_окислитель</span>
<span>3)<span>CaCOз+Н2SO4=CaSO4+CO2+H2O</span></span>
<span><span>Ca 2+ + CO3 2- + 2H+ + SO4 2-=Ca 2+ + SO4 2- + CO2 + H2O</span></span>
<span><span>CO3 2- + 2H+=CO2 + H2O</span></span>
<span><span><span>2HCl+Сu(OH)2=CuCl2+2H2O</span></span></span>
<span><span><span>2H+ + 2Cl- + Cu2+ + 2OH-=Cu2+ + 2Cl- + 2H2O</span></span></span>
<span><span><span>H+ + OH-=H2O</span></span></span>
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