Need some help with the following chemistry equation.?

Question

Would this be right to distinguish a solution of ammonia from water?

Add Iron (III) Chloride

Ammonia solution: NH4OH + FeCl3 -> Fe(OH)3 + NH4Cl
brown precipiate formed.

Water: no reaction

Also, does a "solution of ammonia" definetely have chemical formula NH4OH

Answer 1

A better indicator would be to add CuCl2. Cu forms a tetracoordinate complex with NH3, Cu(NH3)4 (2+), that is a distinctive dark blue color, quite different from the normal Cu(H2O)6 2+ complex that copper forms when dissolved in water.

And yes, the accepted formula of NH3 in H2O is NH4OH.

Answer 2

Yes, your solution is workable.
But i think it would be better to write the fomula like that:
3NH3(aq)+ FeCl3+3H2O(l)--Fe(OH)3(s)+3NH4Cl(aq)