Ammonia gas is passed in excess through copper nitrate solution.state one observation.
Dear student,
Upon a little addition of ammonia(NH3) to copper nitrate solution(Cu(NO3)2), cupric hydroxide(Cu(OH)2) which is a light blue precipitate and ammonium nitrate(NH4NO3) are formed which is a double displacement reaction. But when excess of ammonia is bubbled through copper nitrate solution, a blue solution of [Cu(NH3)4](NO3)2 complex is formed which is a complexation reaction.
Since passing ammonia gas through a aqueous solution (water as a solvent) results in the formation of ammonium hydroxide,
NH3(g) + H2O(l) > NH4OH(aq)
2NH4OH(aq) + Cu(NO3)2(aq) > Cu(OH)2(blue precipitate) + 2NH4NO3(aq) (NH3 is in stoichiometric amount here)
NH4OH(aq)(excess) + Cu(NO3)2(aq) > [Cu(NH3)4](NO3)2 (NH3 is in excess amount here)
Hence, upon excess bubbling of ammonia gas through copper nitrate solution results in the formation of a blue solution of copper tetramine complex.
Regards
Upon a little addition of ammonia(NH3) to copper nitrate solution(Cu(NO3)2), cupric hydroxide(Cu(OH)2) which is a light blue precipitate and ammonium nitrate(NH4NO3) are formed which is a double displacement reaction. But when excess of ammonia is bubbled through copper nitrate solution, a blue solution of [Cu(NH3)4](NO3)2 complex is formed which is a complexation reaction.
Since passing ammonia gas through a aqueous solution (water as a solvent) results in the formation of ammonium hydroxide,
NH3(g) + H2O(l)
2NH4OH(aq) + Cu(NO3)2(aq)
NH4OH(aq)(excess) + Cu(NO3)2(aq)
Hence, upon excess bubbling of ammonia gas through copper nitrate solution results in the formation of a blue solution of copper tetramine complex.
Regards