Problem: Complete and balance the half reaction O2(g) →H2O(l) in basic solution.

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We are being asked to balance the given half-reaction under basic solution


Step 1. Balance the non-hydrogen and non-oxygen elements first

O2(g) →H2O(l) 

Step 2. Balance oxygen by adding H2O to the side that needs oxygen (1 O: 1 H2O)

O2(g) →H2O(l) + H2O(l) 


Step 3. Balance hydrogen by adding H+ to the side that needs hydrogen (1 H: 1 H+)

4H+(aq) + O2(g) →2 H2O(l) 

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Problem Details

Complete and balance the half reaction O2(g) →H2O(l) in basic solution.