Ammonium Ion | Chemical Ion | Britannica

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ionic acids

• In acid–base reaction: The Brønsted–Lowry definition

  …ions (cations), such as the ammonium ion (NH4+), which can be derived by the addition of a proton to a molecular base, in this case ammonia (NH3). The hydronium ion (H3O+), which is the hydrogen ion in aqueous solution, also belongs to this class. The charge of these ionic acids,…

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nitrogen cycle

• In soil: Biological phenomena

  …by microorganisms and converted into ammonium ions (NH4+) that can be directly absorbed by some plant roots (for example, lowland rice). The ammonium ions are usually converted to nitrite ions (NO2−) by Nitrosomonas bacteria, followed by a second conversion to nitrate (NO3−) by Nitrobacter bacteria. This very mobile form of…

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