Maybe this is just me being weird, but as far as I can tell the NH3
has no ion.
would be a -1.
The one that comes to me is
Going along with that, since the NH3
is not ionized, I don't see any reason why it would change. Also, the only thing that I can find wrong with this is that all of the products are soluble, so the final answer would be "No net reaction".
I happen to be using this problem for a Christmas assignment, and I know that its a complex ion, so the final answer has to have 1+ molecules/ions bonded to a central metal ion.