text: YOu have to write the reactions correctly to start...... what is the charge on the chromium your two halfs are\nPb(NO3)2 --> Pb3O4 + NO\nCr(MnO4)2 ----> Cr2O3 + MnO2\n\nFollow the rules for acidic soltuion but then turn the H+ into water and add an equal number of OH- on the other side.  Then combine Not really seeing anything that should be a spectator other than the fact I am pretty sure that Pb3O4 got typed wrong in some way.