To construct a complex half equation, follow these steps:
1. Write down the formulae for the reactants and products, then balance the atoms undergoing redox.
2. Balance any oxygen atoms using water.
3. Balance hydrogen atoms using H+
4. Balance the charges by adding electrons
5. Check the number of atoms are balanced.
6. Check the number of charges are balanced, the number of electrons should be equal to the total change in oxidation states.
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