Ammonium

The Ammonium cation is a positively charged polyatomic ion of the chemical formula {{nitrogen}}{{hydrogen}}4+ and a molecular mass of 18.04, resulting from protonation of ammonia (NH3).

Substituted ammonium ions

Any hydrogen in the ammonium ion can be substituted with an alkyl (or other organic radical) group to form an substituted ammonium ion, also called aminium ion; see amine for details. Depending on the number of organic radical groups, it is called a primary, a secondary, a tertiary, or a quaternary ammonium cation. They exist in an equilibrium with the respective substituted amine, depending on the pH. Only quaternary ammonium cations are permanently charged.

Related Topics:
Amine - Quaternary ammonium cation - PH

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: Example:

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:(CH3)2NH (dimethylamine) + H+ (CH3)2N+H2 (dimethylammonium or dimethylaminium ion)

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