Помогите сделать 6 реакций ОВР
1)[tex]KMnO_{4}+KNO_{2}+H_{2}SO_{4}=MnSO_{4}+KNO_{3}+K_{2}SO_{4}+H_{2}O[/tex]
2)[tex]FeSO_{4}+KClO_{3}+H_{2}SO_{4}=Fe_{2}(SO_{4})_{3}+KCl+H_{2}O[/tex]
3)[tex]MnSO_{4}+PbO_{2}+HNO_{3}=HMnO_{4}+Pb(NO_{3})_{2}+PbSO_{4}+H2O[/tex]
4)[tex]FeSO_{4}+K_{2}Cr_{3}O_{7}+H_{2}SO_{4}=Fe_{2}(SO_{4})_{3}+Cr2(SO4)3[/tex]+[tex]K2SO4+H2O[/tex]
5)KMnO4+FeSO4+H2SO4=Fe2(SO4)3+MnSO4+K2SO4+H20
6)KMn04+H2S+H2SO4=K2SO4+MnSO4+S+H2O
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Answers & Comments
1)Mn(+7) +5e =Mn(+2)-2
N(+3) -2e =N(+5)-5
2Mn(+7) +5N(+3) = 2Mn(+2) +5N(+5)
2KMnO4+5KNO2+3H2SO4=2MnSO4+5KNO3+K2SO4+3H2O
2)2Fe(+2) - 2e =2Fe(+3)-3
Cl(+5) -6e =Cl(-) -1
6Fe(+2) +Cl(+5) = 6Fe(+3) +Cl(-)
6FeSO4+KClO3+3H2SO4=3Fe2(SO4)3 +KCl+3H2O
3)Mn(+2) -5e=Mn(+7)-4
2Pb(+4) +4e =2 Pb(+2)-5
4Mn(+2) +10Pb(+4)= 4Mn(+7) +10Pb(+2)
4MnSO4+10PbO2 +12HNO3= 4HMnO4 +6Pb(NO3)2+4PbSO4+4H2O
4)2Fe(+2) -2e =2Fe(+3)-3
2Cr(+6) +6e =2Cr(+3)-1
6Fe(+2) +2Cr(+6) = 6Fe(+3) +2Cr(+3)
6FeSO4+K2Cr2O7+7H2SO4=3Fe2(SO4)3 +Cr2(SO4)3+K2SO4+7H2O
5)Mn(+7) +5e =Mn(+2)-2
2Fe(+2)-2e =2Fe(+3)-5
2Mn(+7) +10Fe(+2) =2Mn(+2) +10Fe(+3)
2KMnO4+10FeSO4+8H2SO4=5Fe2(SO4)3+2MnSO4+K2SO4+8H2O
6)Mn(+7)+5e=Mn(+2)-2
S(-2) -2e=S(0)-5
2Mn(+7) +2S(-2)=2Mn(+2)+5S(0)
2KMnO4+5H2S+3H2SO4=2MnSO4+K2SO4+5S+8H2O