CuSO4(aq) + 4NH3(aq) → [Cu(NH3)4]SO4(aq)

Question

I know that adding nitric acid will reverse the reaction. But what is the actual chemical equation?

[Cu(NH3)4]SO4(aq) + HNO3(aq) --> ???

Answer 1

The HNO3 reacts with NH3.
HNO3 + NH3 ==> NH4NO3. This results in taking away the NH3 so the complex Cu(NH3)4^+2 can't form.