Ammonium

The ammonium cation is a positively charged polyatomic ion with the chemical formula NH₄⁺. It is formed by the protonation of ammonia (NH₃). Ammonium is also a general name for positively charged or protonated substituted amines and quaternary ammonium cations (NR₄⁺), where one or more hydrogen atoms are replaced by organic groups (indicated by R).

Acid base properties

The ammonium ion is generated when ammonia, a weak base, reacts with Brønsted acids (proton donors):

The ammonium ion is mildly acidic, reacting with Brønsted bases to return to the uncharged ammonia molecule:

Thus, treatment of concentrated solutions of ammonium salts with strong base gives ammonia. When ammonia is dissolved in water, a tiny amount of it converts to ammonium ions:

The degree to which ammonia forms the ammonium ion depends on the pH of the solution. If the pH is low, the equilibrium shifts to the right: more ammonia molecules are converted into ammonium ions. If the pH is high (the concentration of hydrogen ions is low), the equilibrium shifts to the left: the hydroxide ion abstracts a proton from the ammonium ion, generating ammonia.

NH4

NH4 or NH 4 or NH-4 may refer to:

Udhayam NH4

Udhayam NH4 is a 2013 Indian Tamil romantic thriller directed by debutant Manimaran, a former associate of Vetrimaaran. The film features Siddharth and newcomer Ashrita Shetty in the lead roles.Vetrimaaran wrote the script, did the screenplay, and penned the dialogues for this film. The story takes place in Bangalore, Karnataka. The film's soundtrack and background score were composed by G. V. Prakash Kumar. The film released along with a dubbed Telugu version titled NH4 on 19 April 2013.

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