Molecular formula : NH4 +
nature : it is acid or ammonia and water, and the latter H + formed by combining NH4 + ion complex. The correct name is ammonium ions. Because of the many chemical behavior and alkali metal ions Oh, so it's metal in English suffix "radon" and the Chinese side near the metal, "Smith." However, alkali metals and different, there is no free of ammonium, and the only negative ion composition can be meaningful, such as ammonium hydroxide, ammonium bicarbonate, etc.. Ammonia also some salt and the metal ions complex ions, such as Ag (NH3) +2, Cu (CH3) 2 +4, etc. were called silver ion ammonia or ammonia copper ion nor known as ammonium ion. Identification of ammonium alkali is used (such as NaOH) solution instillation of unknown compounds, ammonia precipitation and easy to detect.
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