* Hydrogen sulfide gas (H₂S) is released. This gas has a characteristic rotten egg smell.
* Zinc chloride solution (ZnCl₂) is formed.
The balanced chemical equation for this reaction is:
ZnS(s) + 2HCl(aq) → ZnCl₂(aq) + H₂S(g)
Here's what happens:
1. Hydrochloric acid (HCl) is a strong acid, meaning it readily donates protons (H⁺ ions) in solution.
2. Zinc sulfide (ZnS) is a solid that dissolves in the presence of acid.
3. The H⁺ ions from HCl react with the sulfide ions (S²⁻) from ZnS, forming hydrogen sulfide (H₂S), a weak acid that exists as a gas at room temperature.
4. The zinc ions (Zn²⁺) from ZnS combine with the chloride ions (Cl⁻) from HCl to form zinc chloride (ZnCl₂) , which remains dissolved in the solution.
It's important to note that hydrogen sulfide gas is highly toxic and should be handled with extreme caution in a well-ventilated area.
