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ionic equation

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ionic equation

Equation showing only those ions in a chemical reaction that actually undergo a change, either by combining together to form an insoluble salt or by combining together to form one or more molecular compounds. Examples are the precipitation of insoluble barium sulphate when barium and sulphate ions are combined in solution, and the production of ammonia and water from ammonium hydroxide.

Ba2+(aq) + SO42-(aq) → BaSO4(s)

NH4+(aq) + OH−(aq) → NH3(g) + H2O(l)

The other ions in the mixtures do not take part and are called spectator ions.
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