The decomposition of solid sodium sulfide (Na₂S) in aqueous solution does not occur as a simple decomposition reaction. Instead, it undergoes hydrolysis, reacting with water to form hydrogen sulfide (H₂S) gas and sodium hydroxide (NaOH) in solution.

Here's the balanced chemical equation for the hydrolysis reaction:

Na₂S(s) + 2H₂O(l) → H₂S(g) + 2NaOH(aq)

Explanation:

* Na₂S(s): Solid sodium sulfide.

* H₂O(l): Liquid water.

* H₂S(g): Hydrogen sulfide gas.

* NaOH(aq): Sodium hydroxide in aqueous solution (dissolved in water).

Key Points:

* The reaction is exothermic, meaning it releases heat.

* The hydrogen sulfide gas produced has a characteristic rotten egg smell.

* The solution becomes basic (alkaline) due to the formation of sodium hydroxide.