Material:
- 50ml Falcon tubes
- Test tubes
- Pyrite (coarse-grained)
- Universal indicator (liquid)
- Distilled water
- Fill the tubes halfway each as follows:
Tube 1: tap water
Tube 2: approx. 1 cm high pyrite and tap water
Tube 3: distilled water
Tube 4: approx. 1 cm high pyrite and distilled water - Close the tubes and shake everything well. Then let everything stand for about 5 minutes.
- Fill a test tube approx. 2 cm high with the solution from tube 1, into a second test tube approx. 2 cm high with the solution from tube 2, etc.
- Add 2 drops of the universal indicator to each test tube and swirl gently.
