Editing Ammonia
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==Background== | ==Background== | ||
The ammonia molecule has a trigonal pyramidal shape, as predicted by VSEPR theory. The [[ | The ammonia molecule has a trigonal pyramidal shape, as predicted by VSEPR theory. The [[nitrogen]] atom in the molecule has a lone electron pair, and ammonia acts as a base, a proton acceptor. This shape gives the molecule a dipole moment and makes it polar so that ammonia readily dissolves in [[water]]. The degree to which ammonia forms the ammonium ion increases upon lowering the pH of the solution— at "physiological" pH (~7), about 99% of the ammonia molecules are protonated. Temperature and salinity also affect the proportion of NH4<sup>+</sup>. NH4<sup>+</sup> has the shape of a regular tetrahedron. | ||
Ammonia is found in small quantities in the atmosphere, being produced from the putrefaction of nitrogenous animal and vegetable matter. Ammonia and ammonium salts are also found in small quantities in rainwater. Ammonium salts also are found distributed through all fertile soil and in seawater. Substances containing ammonia, or those that are similar to it, are called ''ammoniacal''. | Ammonia is found in small quantities in the atmosphere, being produced from the putrefaction of nitrogenous animal and vegetable matter. Ammonia and ammonium salts are also found in small quantities in rainwater. Ammonium salts also are found distributed through all fertile soil and in seawater. Substances containing ammonia, or those that are similar to it, are called ''ammoniacal''. | ||
