Category: Experimental Design

Drying agents are substances that can be used to obtain a dry sample of a gas by removing its moisture content.

Examples:
* Anhydrous calcium chloride (for any gas except ammonia)
Ammonia will react with calcium chloride.
4NH₃ (g) + CaCl₂ (s) –> CaCl₂.4NH₃ (s)

* Concentrated sulfuric acid (for any gas except alkaline gases such as ammonia)

* Calcium oxide
(for any gas except acidic gases such as CO₂ and SO₂)

Downward delivery: chlorine gas, carbon dioxide gas, sulfur dioxide gas

Upward delivery: hydrogen gas, ammonia gas

Displacement of water: hydrogen gas, carbon dioxide gas

Ammonium chloride, iodine crystals, dry ice, naphthalene.

Ammonia, sulfur dioxide, hydrogen chloride