Balancing Redox Reactions: Acidic Solutions Video Lessons

Concept: Balancing Redox Reactions: Acidic Solutions

# Problem: CH4 + 2O2 → CO2 + 2H2ODetermine the total number of electrons transferred in this reaction.

###### FREE Expert Solution

Before balancing the redox reaction, we need to ignore H+, OH, and H2O in the reaction since these will be added later.

Step 1: Separate the whole reaction into two half-reactions:

CH4  CO2                                                            2 O2  2 H2O

Step 2: Balance the non-hydrogen and non-oxygen elements first:

CH4  CO2                                                            2 O2  2 H2

Step 3: Balance oxygen by adding H2O to the side that needs oxygen (1 O: 1 H2O):

2 H2O + CH4  CO2                                                            2 O2  2 H2O + 2 H2O

Step 4: Balance hydrogen by adding H+ to the side that needs hydrogen. (1 H: 1 H+):

2 H2O + CH4  CO2 + 8 H+                                                 8H+ + 2 O2  4 H2

Step 5: Balance the charges: add electrons to the more positive side (or less negative side):

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###### Problem Details

CH4 + 2O2 → CO2 + 2H2O

Determine the total number of electrons transferred in this reaction.