What would be the products of this chemical reaction??

Co(NO3)2 (aq) + NH3 (aq) = ??????

a precipitate is supposed to be formed.

Actually there are two products depending upon the concn of the NH3.

NH3 + H2O ==> NH4^+ + OH^-

Reaction 1:
Cu^2+ + 2OH^- ==> Cu(OH)2(ppt)

Reaction 2:
Cu^2+ + 4NH3 ==> Cu(NH3)4^2+(vivid blue soln)