Balancing Redox Equations. Many redox reactions are too complex to simply balance by inspection we must ensure that the e- lost and gained balance There are 2 methods to balance redox rxn: Half reaction Using oxidation numbers. Half Rxn Method. We’ll balance:
Sn + HNO3 SnO2 + NO2 + H2O
Step 2: write the half rxn, using only elements that change in oxidation number. Then add e- to balance the charges.
Step 3: Multiply each reaction by the lowest whole number so that e- lost = e- gained.
I2 + Cl2 + H2O HIO3 + HCl
K2Cr2O7 + FeCl2 + HCl CrCl3 + KCl + FeCl3 + H2O