* Chemical properties describe how a substance reacts or changes when interacting with other substances. Solubility in ammonia is a specific example of this. It tells us how a substance interacts with ammonia, a chemical reagent.

* Solubility involves the formation of new interactions between the substance and ammonia molecules. This is a chemical change, even if it's just a change in state (dissolving).

* Physical properties, on the other hand, are observable without changing the substance's chemical composition. Examples include color, density, melting point, etc.

In conclusion, solubility in ammonia is a chemical property because it describes the substance's ability to react with ammonia, forming a new interaction, and potentially leading to a change in state.