Question

Why does the test tube become cold when ammonium chloride is dissolved in water in a test tube?

Answer 1

Ammonium chloride, a water-soluble salt of ammonia, is slightly acidic as a water-based solution. The acidic component of ammonium chloride (Cl-) produces hydrogen (H+) ions when dissolved in water. The basic component (NH4+) produces hydroxide (OH-) ions when dissolved in water.