Ammonium sulfate is made by reacting ammonia (NH₃), which is a base, with sulfuric acid (H₂SO₄), which is an acid.

Here's the balanced chemical equation:

2 NH₃ + H₂SO₄ → (NH₄)₂SO₄

In this reaction:

* Ammonia (NH₃) acts as the alkali.

* Sulfuric acid (H₂SO₄) acts as the acid.

* The product formed is ammonium sulfate ((NH₄)₂SO₄).