| Q: | Which of the following is the correct balanced chemical equation for the reaction that takes place at the anode of a lead storage battery? |
| A |
| Pb2+ -> Pb |
| B |
| Pb + SO42- -> PbSO4 + 2e– |
| C |
| Pb -> Pb2 |
| D |
| 2e– + PbO2 + 4H+ + SO42- -> PbSO4 + 2H2O |
B is the correct answer here. If we remember that lead batteries are actually lead-acid batteries, then A and C can be eliminated right away. Both can also be eliminated because they aren’t balanced equations. Next, we need to remember that the anode is where electrons leave the battery. The acronym ACID means anode current into device. Remember that the direction of electric current is opposite the direction of electron flow. D is the reaction for the entire battery. B is correct as it is both balanced and results in the release of electrons.