Preparation & Collection of Gases
PreparationZinc + dilute hydrochloric acid
Water solubilitylow
Densitylighter than air
Why this method?H₂ is insoluble or only slightly soluble in water, so it can displace water.
Gas to prepare
Collection method
- Collect hydrogen using the method allowed by its low solubility in water
- Collect ammonia without water, remembering that NH₃ is lighter than air
- Collect carbon dioxide by using its greater density to push air upwards
- Collect highly water-soluble hydrogen chloride gas without losing it into water