How to get nitrogen by passing air over copper gauze?
Answers
Copper combines with oxygen to make copper oxide and nitrogen gas passes over. This nitrogen can be collected by downward displacement of water. By burning phosphorous in air: Nitrogen gas can be prepared by burning phosphorous in air.
Answer:
Pure nitrogen is obtained when a mixture of nitric oxide (or nitrous oxide) and ammonia is passed over heated copper gauze or platinised asbestos. The nitric oxide (from nitric acid and copper turnings) is passed through strong ammonia solution, and the mixed gases led through a heated combustion tube containing either rolls of copper gauze or platinised asbestos. Purification is effected by passing the gas successively through dilute sulphuric acid, fused caustic potash, concentrated sulphuric acid, and finally red-hot copper gauze