“Сombustible gel” experiment
How to make fuel from eggshell and vinegar
Have you just eaten a boiled egg? Don’t throw away the shell – you can make fuel from it!
Wear protective gloves, glasses and a mask and work in a well-ventilated room.
Warning! Only under adults supervision.
Reagents and equipment:
- eggshell (50 g, or you can also use chalk or building lime);
- 70% vinegar (50 ml);
- 96% ethyl alcohol;
- lid for the beaker;
- glass container.
Put the eggshell in the glass and pour acetic acid over it. Then add 30 ml of water. Close with a lid and keep it for a week in a place that is inaccessible to children and animals. Then add 30 ml of water to the glass and stir thoroughly. Filter the obtained solution through a funnel with cotton wool. In a few seconds the solution will turn into gel.
Eggshells consist almost entirely of calcium carbonate. They dissolve in acetic acid, forming calcium acetate. If ethyl alcohol is added to a solution of calcium acetate, a combustible gel forms which can be used as a fuel tablet. The gel forms because calcium ions are solvated by molecules of ethyl alcohol, which surround the calcium ions from all sides.
This gel should be stored in a sealed container so that the alcohol does not evaporate.