The reaction between ammonium sulfate ((NH₄)₂SO₄) and sodium hydroxide (NaOH) is a double displacement reaction that produces sodium sulfate (Na₂SO₄), ammonia (NH₃), and water (H₂O).

Here's the balanced chemical equation:

(NH₄)₂SO₄ (aq) + 2NaOH (aq) → Na₂SO₄ (aq) + 2NH₃ (g) + 2H₂O (l)

Explanation:

* (NH₄)₂SO₄ (aq): Ammonium sulfate is dissolved in water (aqueous solution).

* 2NaOH (aq): Sodium hydroxide is also dissolved in water.

* Na₂SO₄ (aq): Sodium sulfate forms and remains dissolved in water.

* 2NH₃ (g): Ammonia gas is produced and released into the air.

* 2H₂O (l): Water is produced as a liquid.

Key Observations:

* The reaction is exothermic, meaning it releases heat.

* The pungent odor of ammonia gas can be easily detected.

* The solution will become slightly basic due to the formation of ammonia.

Important Note: This reaction is commonly used to prepare ammonia gas in the laboratory.