ammonium nitrate and ammonium sulfate – can be identified by heating a solution of the ions with sodium hydroxide. This reaction produces ammonia gas, as shown in the ionic equation below: ...

Even minor traces of chloride, sulfate, and sodium hydroxide can cause severe problems ... cation resin column to exchange all cations, e.g. ammonium, sodium, calcium, etc., for hydrogen ions).

Science presenter Jon Chase demonstrates an exothermic and an endothermic reaction, and explains how temperature changes can be used to identify which reaction is which. The exothermic reaction is ...