Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed leave it blank. If no reaction occurs leave all boxes blank and click on "Submit". Use H3O + for hydronium ion. Write a net ionic equation for the reaction that occurs when excess hydrobromic acid (aq) and zinc sulfide are combined.

ZnS (s) ⇄ S²⁻ (aq) + Zn²⁺ (aq)

Explanation:

First, we will write the molecular equation, since it is easier to balance.

2 HBr (aq) + ZnS (s) ⇄ H₂S (aq) + ZnBr₂ (aq)

In the full ionic equation we include all ions and molecular species.

2 H⁺ (aq) + 2 Br⁻ (aq) + ZnS (s) ⇄ 2 H⁺ (aq) + S²⁻ (aq) + Zn²⁺ (aq) + 2 Br⁻ (aq)

In the net ionic equation we include only the ions that participate in the reaction and the molecular species.

ZnS (s) ⇄ S²⁻ (aq) + Zn²⁺ (aq)