The reaction between hydrogen sulfide gas (H₂S) and iron(III) chloride (FeCl₃) is a precipitation reaction. Here's the balanced chemical equation:

2 FeCl₃(aq) + 3 H₂S(g) → Fe₂S₃(s) + 6 HCl(aq)

Explanation:

* FeCl₃(aq): Iron(III) chloride is dissolved in water, forming an aqueous solution.

* H₂S(g): Hydrogen sulfide is a gas that is bubbled through the solution.

* Fe₂S₃(s): Iron(III) sulfide is a solid precipitate that forms from the reaction.

* HCl(aq): Hydrochloric acid is formed as a byproduct of the reaction, also in aqueous solution.

Key points:

* This reaction is an example of a metathesis reaction where the ions of the reactants exchange places.

* Iron(III) sulfide is a black precipitate that is insoluble in water.

* Hydrogen chloride is a strong acid and will remain dissolved in the solution.

Overall, the reaction can be described as hydrogen sulfide gas reacting with iron(III) chloride to form iron(III) sulfide precipitate and hydrochloric acid.