When zinc chloride (ZnCl₂) reacts with hydrogen sulfide (H₂S), it forms zinc sulfide (ZnS) and hydrochloric acid (HCl).

Here's the balanced chemical equation:

ZnCl₂(aq) + H₂S(g) → ZnS(s) + 2HCl(aq)

Let's break down what happens:

* Zinc chloride (ZnCl₂) is an ionic compound that dissolves in water.

* Hydrogen sulfide (H₂S) is a gas with a characteristic rotten egg smell.

* Zinc sulfide (ZnS) is a white solid that is insoluble in water.

* Hydrochloric acid (HCl) is a strong acid that remains dissolved in water.

This reaction is a double displacement reaction, where the ions of the reactants switch partners to form new products.