WARNING! This experiment is dangerous! You should NOT perform this at home. ONLY carry out this experiment, if you are a trained chemist, and you understand local safety and legal requirements, which are required to perform such experiments
- Put about 30 g of potassium hydroxide into a beaker.
- Dissolve potassium hydroxide in about 200 ml of water.
- Cut an aluminum can to pieces and put them into the potassium hydroxide solution.
- When the can is dissolved in the potassium hydroxide solution, filter the solution.
- Slowly add about 52.5 ml of concentrated sulfuric acid to the obtained solution. (A lot of heat is produced in this process, be careful!)
- Add 200 ml of water and heat the solution at stirring.
- Cool down and evaporate solution during a few days. Crystals of alum are formed.