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    Balancing Redox Reactions

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    Bibhudutta Panda
    The document provides 21 redox reactions and asks to balance each one using the half-reaction method. It provides instructions on how to balance oxygen by adding hydrogen ions and water molecules. Reactions include those involving permanganate, iodine, bromine, chlorine, zinc, mercury, copper, nitrate, chromium, manganese, tin, aluminum, and more.

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    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd

    Balancing Redox Reactions

    Uploaded by

    Bibhudutta Panda
    218 views3 pages
    The document provides 21 redox reactions and asks to balance each one using the half-reaction method. It provides instructions on how to balance oxygen by adding hydrogen ions and water molecules. Reactions include those involving permanganate, iodine, bromine, chlorine, zinc, mercury, copper, nitrate, chromium, manganese, tin, aluminum, and more.

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    Balancing Redox Reactions

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    © Attribution Non-Commercial (BY-NC)

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    The document provides 21 redox reactions and asks to balance each one using the half-reaction method. It provides instructions on how to balance oxygen by adding hydrogen ions and water molecules. Reactions include those involving permanganate, iodine, bromine, chlorine, zinc, mercury, copper, nitrate, chromium, manganese, tin, aluminum, and more.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    218 views3 pages

    Balancing Redox Reactions

    Uploaded by

    Bibhudutta Panda
    The document provides 21 redox reactions and asks to balance each one using the half-reaction method. It provides instructions on how to balance oxygen by adding hydrogen ions and water molecules. Reactions include those involving permanganate, iodine, bromine, chlorine, zinc, mercury, copper, nitrate, chromium, manganese, tin, aluminum, and more.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    The passage discusses balancing redox reactions through half-reaction and acid-base techniques.

    Redox reactions are chemical reactions where oxidation and reduction occur simultaneously.

    Redox reactions are balanced by using the half-reaction method, where the reaction is broken into separate oxidation and reduction half-reactions.

    Balancing Redox Reactions

    Page 128

    Balance the following reactions using the Half-Reaction technique. Refer to the instructions and the example of the permanganate-oxalate reaction. 1) 1 x 2 x Fe3+ 2IFe3+ + + + + + II2 1e2IBrBr2 2e Hg22+ Zn2+ Hg22+ + + Br2 + Fe2+ + 2eFe2+ 2Fe2+ Br2 2e2Cl+ I2

    2Fe3+ 2) 1 x 1 x Cl2 3) 1 x 1 x Zn 4) 1 x 1 x 2I5) 1 x 1 x Cu 6) 8 x 3 x I2e2I+ Zn Zn 2e+ Cl2 2BrCl2

    + Cl-

    I2

    + 2Br+ +

    + 2ClZn2+ 2e2Hg + + Hg

    Hg22+ + +

    Zn2+

    2Hg I2 Cu2+ NO2+ I2 ClO3+ + + + ClO3+ H2O + + H2O + H2O

    ClO4ClO4I2

    + H+ + 2H+ 2e-

    ClO4-

    + 2H+

    ClO3NO2H2O + H2O

    H2O

    Cu + Cu 2e- + + H2S + 6e- + 8H2S

    NO3+ H+ 2+ Cu + 2eNO3+ 2H+ + 2H+

    NO3-

    Cu2+

    NO2+ +

    Cr2O72Cr2O72 S8 +

    + H+ Cr3+ + + 14H 2Cr3+ + + 16H + 16e64H+ 16Cr3+

    S8 7H2O

    H2O

    24H2S + 8Cr2O727) 2 x 3 x

    + 3S8

    + 56H2O H2O

    MnO4+ C2O42- + OHMnO4 + 3e+ 2H2O 2C2O4 + 4OH 2CO32-

    MnO2 + MnO2 + 2H2O + + 6CO32-

    CO32- + + 4OH2e+ 2H2O

    2MnO4- + 3C2O42- + 4OH-

    2MnO2

    Balancing Redox Reactions

    Page 129

    Balance the following in acid solution. (To balance the oxygen, add H+s to one side of the reaction and H2Os to the other side.) 8) 2 5 MnO4 MnO4 H2O 6H+ + Cu 4H+ 3Cu + + NO2 Mn2+ + 5e + 8H+ + NO2 2H+ + 2MnO4 + 5NO2 + NO3 NO + 3e + NO3 Cu Cu2+ + 2NO3 + 8H+ + NO3 Mn2+ + 4H2O NO3 + 2e 2Mn2+ + 5NO3

    3H2O

    9) 2 3

    + Cu2+ NO 2e 2NO

    + +

    2H2O 3Cu2+ + 4H2O

    10) Fe3+ + 6 1e 1 7H2O + 6Fe3+ + 11) MnO4 5 2 MnO4 2MnO4

    Cr3+ Cr2O72 + + Fe3+ Fe2+ 2Cr3+ Cr2O72 7H2O + 2Cr3+

    Fe2+ + 6e Cr2O72 + + 14H+ 6Fe2++ 14H+

    + H2O Mn2+ + H2O2 2H2O H2O2 + 2e + 2H+ + + 5e + 8H Mn2+ + + + 2H2O + 6H 2Mn2+ + + Hg Au + 3e Au 2Hg Hg2Cl2 6Hg 2Au + + Hg2Cl2 + 4Cl + 2e 3Hg2Cl2 +

    4H2O 5H2O2 + Cl

    12) AuCl4 2 AuCl4 3 2Cl + 2AuCl4 + 13) NO3 2 NO3 3 2H2O 2H2O +

    2Cl

    + SO2 + 3e + SO2 2NO3 +

    SO42 + NO + 4H+ 2H2O SO42 + 2e 3SO2 3SO42

    + + +

    NO 4H+ 2NO

    4H+

    14) N2H5+ + SbCl4 SbCl6 + NH4+ (Hint: Cl is also present.) 1 2Cl + SbCl4 SbCl6 + 2e + + 1 N2H5 + 3H + 2e 2NH4+ + + 3H + 2Cl + N2H5 + SbCl4 SbCl6

    2NH4+

    Balancing Redox Reactions

    Page 130

    Balance the following in basic solution. (To balance the oxygen, add OHs to one side of the reaction and H2Os to the other side.) 15) Sn(OH)3 2 3e 3 Sn(OH)3 3Sn(OH)3 16) NO2 1 2OH 1 1e 2NO2 + 17) MnO4 3 2OH 2 MnO4 2MnO4 18) N2H4 1 N2H4 2 2e N2H4 + 19) Al 2 Al 3 2e 3Al + + Bi(OH)3 Sn(OH)62 + Bi Bi(OH)3 Bi + 3OH + 3OH Sn(OH)62 + 2e 2Bi(OH)3 + 3OH 3Sn(OH)62

    + +

    2Bi

    NO3 + NO2 + NO2 NO3 + NO2 NO2 2OH NO3 +

    1e +

    + H2O

    H2O

    NO2

    + +

    + NO2 MnO2 NO2 NO3 + + 3e + 2H2O 3NO2 + H2O

    + NO3 2e + MnO2 MnO2 + Cu 4H2O + + 2OH + 2Cu

    H2O + 4OH + NO3

    2OH

    + Cu(OH)2 N2 + 4OH N2 + + Cu(OH)2 Cu 2Cu(OH)2 N2 + H2O + 6OH + 2H2O 6OH +

    4e + 4H2O

    Al(OH)63 + H2 Al(OH)63 + 3e H2 + 2OH 6H2O 2Al(OH)63 +

    3H2

    20) Cr(OH)3 3 2H2O + 2 Cr(OH)3 2Cr(OH)3 21) 3 2 3Zn Zn Zn 3e + + + + 2CrO42

    + H2O2 CrO42 + 2e + H2O2 2H2O + 5OH CrO42 + + 3H2O2 + 4OH

    H2O + 2OH 4H2O + 2CrO42

    3e + 8H2O

    CrO42 [Zn(OH)4]2 + Cr(OH)3 4OH [Zn(OH)4]2 + 2e 2 CrO4 + 4H2O Cr(OH)3 + 5OH + 2OH + 8H2O 3[Zn(OH)4]2 +2Cr(OH)3

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