Tests of Ammonia
The presence of ammonia in any sample may be confirmed by following tests:
- Ammonia has a characteristic pungent smell, (called ammoniacal smell).
- Ammonia turns most red litmus blue and moist turmeric paper brown.
- Ammonia, when added to a solution of copper sulphate, turns the solution deep
- When a glass rod dipped in canc. HCI is brought closer to ammonia dense white fumes are observed.
NH3 + HCl → NH4Cl (white fumes)
- Ammonia, when added to Nessler’s reagent (alkaline solution of K[HgI3]), gives the brown precipitate.