Bleeding Iron is an experiment in which you can make an iron nail bleed. This can be done by using only few chemicals. In this experiment we prepare a solution of Potassium Thiocyacyanate, Hydrogen Peroxide and Concentrated Hydrochloric Acid. When an iron nail is put in this solution it starts bleeding!
Working principle of the activity
The chemistry behind this bleeding iron experiment is, when we drop the iron nail in the prepared solution. First the hydrochloric acid and the hydrogen peroxide are reacting with the iron to produce iron (III) ions. Also, Potassium Thiocyanate reduces into thiocyanate ions. The iron (III) ions then react with these Thiocyanate ions to produce Iron Thiocyanate ions. These Iron Thiocyanate ions are red in colour and give the appearance of blood. But since it only forms near the surface of the nail, it appears the nail is bleeding.