I have to write a net ionic equation for Cr and silver nitrate, but I am confused on which valence state to use, since Cr has multiple valence states ie +2, +3 and + 6.
2. The attempt at a solution
If I use the valence state of +2 I end up with:
Cr(s) + 2 Ag+(aq) = 2 Ag (s) + Cr2+(aq)
But if I use +3 I end up with:
Cr(s) + 3Ag+(aq) -> 3Ag(s) + Cr3+(aq)
So which one do I use? and is there a rule to follow?