What are some factors that must be taken into account when balancing equations for redox reactions?

Answer 1

- known oxidation levels of the participants
- conditions under which the reaction will take place (i.e. possible subsequent reactions which may tip the equilibrium elsewhere, like precipitation of MnO2 in alkaline medium rather than reduction to Mn(2+) from KMnO4).
- electron balance. Write the partial reactions for a single component giving up or gaining electrons, then multiply so that you get the smallest possible whole number for all factors.

Answer 2

Never forget what the pH of the system is. If it's acidic H+ needs to be in there etc. Use water to balance and then follow the rules. Sometimes it's a pain, but you'll get through it.

Answer 3

you need to know the oxidation states of everything and make sure that you have the correct number of each atom on each side of the equation also you cannot forget about the possibility of adding acid, base or water to the equation.