Little oil vitriol to much cabbage liquor or water and litmus A small amount of sulfuric acid is added to large quantities of cabbage juice and litmus solution. Concentrated sulfuric acid is used to write on a white sheet of paper. Heated Sulfuric acid sulfurous acid does not do this. 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.