Uploaded September 2023 | Updated September 2026, 3 weeks ago

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We have no confirmatory test for nitrate ions in our exam schemes. Once we used Devardas alloy(Cu/Al) in boiling sodium hydroxide solution to reduce the nitrate ion to ammonia and this probably put people off. It is not required; aluminium foil works just as well and produces a beautiful halo,. Here is a microscale method to identify the ammonia coming off