Balancing Redox Equations

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Balancing Redox Equations

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Themes

Redox equations, half-equations, oxidation couple, reduction couple, balancing redox reactions, electron transfer, H+ ions, H2O molecules, chemical equation balancing, oxidation-reduction reactions, electrochemistry, chemical reactions, reaction balancing, redox reaction mechanism, half-reaction method

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Abstract

Learn how to balance redox equations by writing half-equations for oxidation and reduction couples, combining them, and simplifying the final equation.

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[...] 2 SO42- + 2Fe2+ ClO4-/Cl2 and Fe3+/Fe2+ : ClO4- + 8H+ + 8Fe2+ ? Cl2 + 4H2O + 8Fe3+ MnO4-/Mn2+ and I2/I- : 2 MnO4- + 16 + 10 ? 2Mn2+ + 8 H2O + 5 I2 MnO4-/Mn2+ et C2H2O4/CO2 : 2 MnO4- + 6H+ + 5 C2H2O4 ? 2 Mn2+ + 8H2O + 10 CO2 ClO-/Cl- et Al3+/Al : 3 ClO- + 6 + 2Al ? 3 Cl- + 3 H2O + 2 Al3+ CO2/CH4 et O2/H2O : CO2 + 2 H2O ? [...]

[...] The answers to this exercise for redox equations are as follows: Cu2+/Cu and I2/I- : Cu2+ + 2I- ? Cu + I2 I2/I- et H+/H2 : I2 + H2 ? 2 + 2 Al3+/Al et Cu2+/Cu : 2 Al3+ + 3 Cu ? 2 Al + 3 Cu2+ Zn2+/Zn et Al3+/Al : 3 Zn2+ + 2 Al ? 3 Zn + 2 Al3+ NO3-/NO et Fe3+/Fe2+: NO3- + 4 + 3 Fe2+ ? NO + 2H2O + 3Fe3+ S2O82-/SO42- et Fe2+/Fe : 2O82- + 2Fe ? [...]

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