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
- Since chlorine is a very hazardous gas this experiment should be performed only in a fume hood.
- Сalcium carbide is used to obtain ethyne. Chlorine gas is obtained by treating household bleach with 2M sulfuric acid.
- Pour the acid solution into the beaker.
- Add one pea-sized piece of calcium carbide. The reaction forming ethyne gas begins.
- Using a pipette add about 1 ml of household bleach into the beaker. The reaction of bleach and sulfuric acid gives chlorine gas.
- The bubbles of gases move toward the surface and when they met a small explosion takes place. The walls of the vessel turn black because of carbon formation.
- This experiment could be performed in a little bit more complicated but safer way. Prepare a stand with a clamp, flask, high glass cylinder, glass tube with u-end and flexible connection.
- Fill the cylinder with water.
- Pour some acid into the flask. Set the flask on the stand.
- Add some bleach into the flask. Close the flask with a stopper connected with a glass tube.
- Put the glass tube down the cylinder.
- Drop a few pieces of calcium carbide into the cylinder.
- The reaction with flashes begins.