Ammonia (NH₃) and zinc chloride (ZnCl₂) do not react directly to form a precipitate or a simple gas. However, they can react in an equilibrium reaction to form the tetraamminezinc(II) ion ([Zn(NH₃)₄]²⁺) and chloride ions (Cl⁻).

Here's the balanced equation for this reaction:

ZnCl₂ (aq) + 4 NH₃ (aq) ⇌ [Zn(NH₃)₄]²⁺ (aq) + 2 Cl⁻ (aq)

Explanation:

* ZnCl₂ (aq): Zinc chloride is dissolved in water, forming aqueous ions.

* NH₃ (aq): Ammonia is also dissolved in water, forming aqueous ammonia molecules.

* [Zn(NH₃)₄]²⁺ (aq): This is the tetraamminezinc(II) ion, a complex ion formed when four ammonia molecules coordinate to a zinc(II) ion.

* Cl⁻ (aq): Chloride ions are released from the zinc chloride.

Important Notes:

* The reaction is reversible, meaning it can proceed in both directions. The equilibrium favors the formation of the complex ion.

* The reaction is a Lewis acid-base reaction. Zinc chloride acts as a Lewis acid, accepting electron pairs from ammonia, which acts as a Lewis base.

Let me know if you have any other questions!