Many of my students have problems writing ionic equations. If you understand how this works, then this will not be a problem at all. The most important thing that you need to bear in mind is to find out if that particular substance is soluble in water in the first place.
Follow the following steps.
1. Write down a balanced chemical equation, including the state symbols.
2. For those substances that are soluble in water i.e. aqueous (aq), break them up into the ions.
3. Cancel the spectator ions i.e. those that appear before and after the reaction.
4. Finalise the ionic equation. Make sure that this is balanced as well, including the charges.
Final notes:
1. There are some equations that do not have any ionic equations, simply because there are no ions involved.
2. An ionic equation shows the actual reaction that is going on.
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