Basic chemistry help for students and teachers


Interactive Chemistry Worksheets for Students


Periodic table

Naming compounds

Basic formula

Simple compounds

Ionic compounds 1

Ionic compounds 2

Chemical suffixes

Old chemical names

Hydrocarbons - Alkanes

Alkanes, alkenes & alkynes

Alkanols to alkanoic acids


Common compounds

Common formula quiz

Acids, bases and salts

Covalent compounds

Printable worksheets


The ammonium ion is a positively charged ion or cation and has the chemical formula, NH4+

Ammonium salts are commonly used in fertilizers. Examples of compounds containing the ammonium ion include, ammonium nitrate, NH4NO3 and ammonium sulfate, (NH4)2SO4

All ammonium salts are soluble in water and dissociate or break down to produce aqueous ammonium ions.

eg.  ammonium nitrate ==> ammonium ion + nitrate ion

               NH4NO3(s) ==> NH4+(aq) + NO3-(aq)  where aq = aqueous (surrounded by water) and s = solid

The ammonium ion is formed by the neutralization of the base ammonia, NH3 with and acid

Ammonia + Nitric acid ==> Ammonium nitrate

NH3 + HNO3 ==> NH4NO3

Ammonia + Sulfuric acid ==> Ammonium sulfate

NH3 + H2SO4 ==> (NH4)2SO4

The ammonium ion has one co-ordinate covalent bond which involves the nitrogen atom donating two electrons in one of the N-H bonds.

NH3 + H+ ==> NH4+