Write a net ionic equation for the reaction that occurs when excess hydrobromic acid (aq) and sodium sulfide are combined.

Answer 1

The molecular form is a double replacement reaction:

2HBr(aq) + Na₂S(aq) ⇒ 2NaBr(aq) + H₂S(g)

HBr is a strong acid and NaBr and Na₂S are soluble salts, so they are dissociated as ions:

2H⁺ + 2Br^- + 2Na⁺ + S^2- ⇒ 2Na⁺ + 2Br^- + H₂S (Na⁺ and Br^- are spectators

2H⁺ + S^2- ⇒ H₂S

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