A sample of concentrated sulfuric acid is heated with an oil lamp and fumes. Aqueous sulfur dioxide invisibly degassifies. Water is added to a sample of strong sulfuric acid. The heat produced by this reaction is sufficient to ignite a sample of phosphorus. Little S.A. in bottle of Amm - salt is formed Add sulfuric acid to ammonia.
Ammonium sulfate is formed and the acid is neutralized.
A piece of phosphorus is placed on brown paper. Phosphorus in capsule not fire paper readily dense fumes are produced these are phosphoric acid. This phosphorus and brown paper is placed inside a container and allowed to combust. This produces dense smoke consisting partly of phosphorus pentoxide. Phosphorus in dry basin under bell glass Phosphorus stable in vacuo.