W11. Evaporation of water from different springs
Wherever water dries up white residues are left: In tea pots, at taps, around thermal springs (Photo 1).
What to do
Leave samples from a thermal spring, mineral water and distillilled water for drying up.
Material
Black plastic surface, Leukosilk, permanent marker, 3 labeled dropper bottles with samples from a thermal spring (1), mineral water (2) and distilled water.
Experiment
1. Fix pieces of Leukosilk onto the plastic surface.
2. Write the numbers 1 - 3 on them.
3. Collect 5 drops of each water sample below the numbers 1 - 3 (Photo 2).
4. Wait until the water has completely disappeared.
Observation
Spring water and mineral water leave white dots of different size, Distilled Wasser completely disappears (Photo 3).
Explanation
Only distilled water is pure. The two other samples contain dissolved minerals.
Fountain 1 (Karlovy Vary) is very rich in minerals.