In this method, the two half equations are balanced separately and then added together to give balanced equation.The following steps are involved in this method:
- Produce unbalanced equation for the reaction in ionic form.
- Separate the equation into half-reactions (i.e., oxidation half and reduction half).
- Balance the atoms other than H and O in each half reaction individually.
- For reactions occurring in acidic medium, add H2O to balance O atoms and H+ to balance H atoms.
- Add electrons to one side of the half reaction to balance the charges. If need be, make the no. of electrons equal in the two half reactions by multiplying one or both half reactions by appropriate number.
- Add the two half reactions to achieve the overall reaction and cancel the electrons on each side to get the net ionic equation.
- Verify that the equation contains the same type and number of atoms and the same changes on both sides of the equation. This last check reveals that the equation is fully balanced with respect to no. of atoms and the charges.
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