Zn air batteries have the advantages of high energy density, low cost and are environmentally benign. the redox reaction for zn air batteries is 2zn + o2 →2zno. the electrolyte is 9 m koh. write the cathode and anode half reactions, identify cathode and anode, find cathode and anode standard potential, calculate the half reaction potential at 9 m koh electrolyte (using nernst equation), calculate zn air cell voltage, identify which material is reduced, which one is oxidized.