P(s)+ H+ + NO3- ---> H2PO4 + NO + H2O

Question

I am trying to write the two half rxns and I can get one, but not the other. I have:
red: NO3- +4H+ +3e- ---> NO + 2H2O
Ox: P(s) + ? ----> H2PO4- + x e-

thank you!

Answer 1

Are you stuck on x e^-? If so that is 5e on the right BECAUSE P changes from zero to +5 so 5e must have been added to do that. Then add H^+ and water for the rest of it balance.