In the Lassaine's test for the halogens, the sodium fusion extract is acidified and then treated with silver nitrate. A pale yellow precipitate soluble in ammonium hydroxide shows the presence of ____________
Explanation
The sodium fusion test (Lassaigne's test) is used in qualitative analysis to test for nitrogen, sulphur, phosphorous and halogens. In the test for halogen, silver trioxonitrate
(V) acid is added after prior acidification with \(HNO _{3}\). If any halogen is present, there must be a precipitate.queous ammonia is then used to identify the halogen present. If the precipitate is white and is readily soluble in aqucous ammonia, chlorine is present. If the precipitate is pale yellow and soluble in aqueous ammonia, it is bromine. If deep yellow and insoluble, it is iodine.
