text: how do i balance redox rxn pb(n3)2+cr(mno4)2 yeilds cr2o3+mno2+pb3o4+no using half rxn in basic solution? i figure some of the molecules listed above are spectator ions not need in the half reaction but can not figure out which ones are the spectator ions. if no ones wants to help balance it if you could just tell me the spectator ions you have to write the reactions correctly to start...... what is the charge on the chromium your two halfs are pb(no3)2 --> pb3o4 + no cr(mno4)2 ----> cr2o3 + mno2  follow 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.