sometimes gasses need to be dried before use
| Drying Agent | Example(s) | Notes |
|---|---|---|
Concentrated sulfuric acid | Most gasses, including: - Chlorine - Hydrogen Chloride Acidic gasses | Method is not suitable for gasses that react with sulfuric acid |
Quicklime (calcium oxide) | Ammonia Alkaline gasses | Calcium oxide absorbs moisture and carbon dioxide from air → so it must be freshly heated before use method cannot be used to dry gasses that react with calcium oxide (eg: carbon dioxide) |
Fused calcium chloride | Hydrogen, Nitrogen, Carbon dioxide Good for most gasses | Calcium chloride readily absorbs moisture from air → so it must be heated before use method cannot be used to dry gasses which react with calcium chloride. |
| → must state “pass it through” |