Some redox reactions can be quite complex and difficult to balance. No matter how complex a reaction looks, the number of electrons lost must be equal to the number of electrons gained. This PowerPoint presentation illustrates how to balance redox reactions by the half-reaction method or ion-electron method. This process draws on skills learned earlier including identifying the ions, determining the oxidation states of all the species involved in the reaction, determining what was oxidized and what was reduced, and balancing the electrons lost with the electrons gained. Worksheets on this topic are available free of charge on my website at www.evanschemistrycorner.com.