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Smelling salts are a chemical compound that releases small amounts of ammonia gas, which essentially jump starts your bodyâs nervous system. The ammonia causes blood vessels in your nasal passages to expand providing an instant increase in oxygen to your brain meaning an instantaneous boost of alertness and power.
Ammonium is also used in the production of fertilizers and explosives. It is also used in the rocket propellant and also in water filters and as food preservatives. Summary. 1  Ammonia is a weak base and is un-ionized. 2  On the other hand, Ammonium is ionised.3  Ammonia gives out a strong smell whereas Ammonium does not smell at all.4  Ammonia is toxic or harmful to aquatic organisms.mmonia is a weak base and is un-ionized. On the other hand, Ammonium is ionised. One of the noticeable differences between the two is that Ammonia gives out a strong smell whereas Ammonium does not smell at all.