[thuanthuan]

A book when representing how to identify Cl_- says "add silver nitrate solution" (-> to form precipitate) and then add nitric acid, later followed by ammonium hydroxide. They say what next is that "precipitate will not be dissolved in HNO₃, but it will dissolve in NH₄OH.
I wonder what actually happens in the solution ?
I guess, NH₄OH (if exists) will prioritize to react with acid, so only a small amout of it react with silver nitrate (I'm even not sure if this reaction can occur). So we cannot see the precipitate is remarkably dissolved.

[AWK]

Adding HNO3 to AgCl is for test - most silver salts are soluble in HNO3.
Then to test furter we try to dissolve AgCl in an excess of ammonia - a compnlex [Ag(NH3)2]Cl is soluble in water, and white precipitate disappers.

[thuanthuan]

Thank you, now I got it!