White phosphorus and ozone (potassium iodide starch test) - 1 HD

Белый фосфор и озон (йодокрахмальная проба) - 1 A piece of white phosphorus mass of about 4.5 grams pulled from the water and placed in a Petri dish, next to placed a small cylinder with potassium iodide starch solution. All this is covered by the glass. As it turned out, potassium iodide starch reagent showed the presence of ozone almost immediately: in a minute or two at the top of the solution appears blue border. Then blue solution begins to slowly descend from the top down, forming a kind of vortex rings. http://chemistry-chemists.com/N2_2017/ChemistryAndChemists_2_2017-P5-1.html