The reaction between ammonia (NH3) and calcium chloride (CaCl2) can result in the formation of ammonium chloride (NH4Cl) and calcium hydroxide (Ca(OH)2). The overall reaction can be represented as follows:

2NH3 + CaCl2 --> 2NH4Cl + Ca(OH)2

In this reaction, the ammonia molecules react with the calcium ions (Ca2+) from calcium chloride to form ammonium ions (NH4+). At the same time, the chloride ions (Cl-) from calcium chloride combine with the hydrogen ions (H+) from ammonia to form hydrochloric acid (HCl), which then reacts with calcium hydroxide to form water (H2O) and calcium chloride.

The reaction between ammonia and calcium chloride is characterized by the release of heat, making it an exothermic reaction. The products formed, ammonium chloride and calcium hydroxide, are both soluble in water.