What gases can anhydrous calcium chloride dry?

Anhydrous calcium chloride can dry most neutral gases (such as hydrogen, oxygen, nitrogen, carbon monoxide, methane) and acidic gases (such as hydrogen chloride, carbon dioxide, sulfur dioxide, chlorine gas), but cannot dry ammonia gas (NH3).

Dryable gas types:

Neutral gases: hydrogen (H ₂), oxygen (O ₂), nitrogen (N ₂), carbon monoxide (CO), methane (CH ₄). ‌‌

Acidic gases: hydrogen chloride (HCl), carbon dioxide (CO ₂), sulfur dioxide (SO ₂), chlorine gas (Cl ₂). ‌‌

Non drying gases and reasons:

Ammonia (NH3): Due to its reaction with anhydrous calcium chloride to form a complex (CaCl ₂ · 8NH3), it fails. ‌‌