How do silver ions interact with halide ions? How can the presence of ammonium in aqueous solution be evidenced?

1 Answer
Mar 22, 2017

Answer:

#Ag^+ + Cl^(-) rarr AgCl(s)darr#

Explanation:

Of course, the equation presupposed the ABSENCE of other metal ions that form insoluble halides, i.e. we assume the absence of #Pb^(2+)#, and #Hg_2^(2+)# ions.............

For ammonium ions, we could exploit the acid-base properties of ammonium cation:

#NH_4^+ + HO^(-) rarr NH_3(g)uarr + H_2O(l)#

The odour of ammonia is unmistakable. Ammonium forms an insoluble tetraphenylborate, #NH_4BPh_4#, but tetraphenylborate salts are VERY expensive, and tend not to be used in this scenario.